{"title":"Presidium","description":"","products":[{"product_id":"presidium-ac-adaptor-120v-220v","title":"Presidium AC Adaptors-120V or 220V","description":"\u003cp\u003ePresidium AC Adaptors provide reliable mains power for a range of Presidium gem-testing instruments, replacing or supplementing battery operation. Available in 120V and 220V configurations to suit North American and international electrical standards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompatible instruments include:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePresidium Multitester I and II (PMUT \u0026amp; PMUT II)\u003c\/li\u003e\n\u003cli\u003ePresidium Diamondmate (PDMT)\u003c\/li\u003e\n\u003cli\u003ePresidium Moissanite Tester (PMT)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e The 120V AC adaptor (part # 156.753) is \u003cem\u003enot\u003c\/em\u003e compatible with the current-generation Presidium Multitester III (PMUT III). For the PMUT III, use part # 156.753NEW.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer\u003c\/th\u003e\n\u003ctd\u003ePresidium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Voltages\u003c\/th\u003e\n\u003ctd\u003e120V, 220V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eAvailable Options\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003ePart #\u003c\/th\u003e\n\u003cth\u003eVoltage\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e156.753\u003c\/td\u003e\n\u003ctd\u003e120V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e156.753.220\u003c\/td\u003e\n\u003ctd\u003e220V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eThe 120V adaptor (156.753) is intended for use with Presidium Multitester Series I and II, the Diamondmate, and the Moissanite Tester only. It is \u003cem\u003enot\u003c\/em\u003e for use with the Presidium Multitester III (PMUT III). Select the correct voltage for your region before ordering.\u003c\/p\u003e","brand":"Presidium","offers":[{"title":"120V","offer_id":43578756301014,"sku":"156.753","price":17.0,"currency_code":"USD","in_stock":true},{"title":"220V","offer_id":45125507973334,"sku":"156.753.220","price":24.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/presidium-ac-adaptors-120v-or-220v-otto-frei.jpg?v=1689352325"},{"product_id":"presidium-mpirem-inside-ring-engraving-machine","title":"Presidium MPIREM Inside Ring Engraving Machine","description":"\u003cp\u003eThe \u003cstrong\u003ePresidium MPIREM Inside Ring Engraving Machine\u003c\/strong\u003e is a compact, precision-built diamond drag scratch engraver designed for inside ring engraving. Based on a time-tested design used by jewelers and engravers for over 60 years, this machine delivers the same reliable performance as classic inside ring engravers while taking up significantly less bench space and offering improved portability.\u003c\/p\u003e\u003cp\u003eUnlike lower-quality copies on the market, the Presidium MPIREM features first-class fit and finish with precision-cut and finished dials that deliver a smooth, consistent glide with the tracer — exactly what you need when engraving a customer's heirloom ring.\u003c\/p\u003e\u003cp\u003eThe machine uses a circular dial system for block lettering engraving. The included 2-sided single-line block dial features large upper case slanted type on one side and smaller upper case non-slanted type on the other. This is a fixed-ratio engraving machine, meaning engraving height is determined by the character height on the dial in use. The included dial produces diamond scratch engraving at either \u003cstrong\u003e1mm or 2mm in height\u003c\/strong\u003e on the inside of a ring, depending on which side of the dial is used.\u003c\/p\u003e\u003cp\u003eWhile engraving height is not adjustable, letter spacing can be controlled using the \u003cstrong\u003eratcheting advance mechanism\u003c\/strong\u003e, giving the engraver precise control over character placement.\u003c\/p\u003e\u003cp\u003eThe MPIREM accommodates virtually any ring size and shape through its \u003cstrong\u003eadjustable 3-way ring holding system\u003c\/strong\u003e, making it a versatile everyday workhorse for professional jewelers.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCompact version of the classic inside ring engraver used by tens of thousands of jewelers worldwide\u003c\/li\u003e\n\u003cli\u003ePrecision-cut and finished dials for smooth, consistent tracer glide\u003c\/li\u003e\n\u003cli\u003eFixed-ratio diamond drag scratch engraving system\u003c\/li\u003e\n\u003cli\u003eIncluded 2-sided single-line block dial: large slanted upper case on one side, smaller non-slanted upper case on the other\u003c\/li\u003e\n\u003cli\u003eProduces engraving at 1mm or 2mm character height depending on dial side used\u003c\/li\u003e\n\u003cli\u003eRatcheting advance mechanism for adjustable letter spacing\u003c\/li\u003e\n\u003cli\u003eAdjustable 3-way ring holding system accommodates a wide range of ring sizes and shapes\u003c\/li\u003e\n\u003cli\u003eCompatible with optional type dials including continuous script styles\u003c\/li\u003e\n\u003cli\u003eCompatible with dials designed for similarly configured inside ring engraving machines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eEngraving Method\u003c\/th\u003e\n\u003ctd\u003eDiamond drag scratch engraving\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEngraving Height\u003c\/th\u003e\n\u003ctd\u003e1mm or 2mm (fixed ratio, determined by dial used)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLetter Spacing\u003c\/th\u003e\n\u003ctd\u003eAdjustable via ratcheting advance mechanism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIncluded Dial\u003c\/th\u003e\n\u003ctd\u003e1 double-sided single-line block dial (large slanted upper case \/ smaller non-slanted upper case)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRing Holding System\u003c\/th\u003e\n\u003ctd\u003eAdjustable 3-way\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVariant Count\u003c\/th\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePresidium MPIREM Inside Ring Engraving Machine\u003c\/li\u003e\n\u003cli\u003eOne 2-sided single-line block dial\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eOptional type dials, including continuous script styles, are available separately and are compatible with this machine. Machines of similar configuration include Presidium and Vigor inside ring engravers; note that Vigor-branded machines are no longer in production. Always verify dial compatibility before purchase.\u003c\/p\u003e","brand":"Presidium","offers":[{"title":"Default Title","offer_id":43579912585430,"sku":"126.170PR","price":750.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/presidium-mpirem-inside-ring-engraving-machine-otto-frei-1.jpg?v=1719958375"},{"product_id":"diamond-tip-inside-ring-engraver-1-8-shank","title":"Diamond Tip For Inside Ring Engraver","description":"\u003cp\u003eKeep your inside ring engraving machine performing at its best with this replacement diamond tip. Designed to fit a wide range of popular inside ring engraving machines, this tip is compatible with Vigor-style machines as well as those manufactured under the Pepetools, Presidium, Kanto, and Ikohe brand names. It also fits the Hermes inside ring engraving machine, making it a versatile replacement option for many professional engraving setups.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Before ordering, verify that your machine accepts a diamond tip with a shank diameter of 1\/8\". This tip is not universal to all machines.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eReplacement diamond tip for inside ring engraving machines\u003c\/li\u003e\n\u003cli\u003eCompatible with Vigor-style machines and those built to the same design\u003c\/li\u003e\n\u003cli\u003eAlso fits Hermes inside ring engraving machines\u003c\/li\u003e\n\u003cli\u003eSuits machines sold under the Pepetools, Presidium, Kanto, and Ikohe names\u003c\/li\u003e\n\u003cli\u003eStraightforward drop-in replacement for worn or damaged tips\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eShank Diameter\u003c\/th\u003e\n\u003ctd\u003e1\/8\" (3.15mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength\u003c\/th\u003e\n\u003ctd\u003e3\/8\" (10mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTip Type\u003c\/th\u003e\n\u003ctd\u003eDiamond\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity\u003c\/th\u003e\n\u003ctd\u003e1 tip\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003eConfirm your machine's required shank diameter is 1\/8\" before placing your order. Not all inside ring engraving machines use this shank size.\u003c\/p\u003e","brand":"Presidium","offers":[{"title":"Default Title","offer_id":43579918450902,"sku":"126.170A","price":43.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/diamond-tip-for-inside-ring-engraver-otto-frei.jpg?v=1719958368"},{"product_id":"presidium-dial-gauge-pdg-high-setting-attachment","title":"Presidium Dial Gauge PDG With Book, High Setting Attachment","description":"\u003cp\u003eThe Presidium Dial Gauge (PDG) is a precision millimeter gauge designed for gemstone measurement, weight estimation, and ring sizing. Functioning similarly to the Leveridge gauge, the PDG delivers enhanced performance through a patented nonstick rack and pinion slide mechanism that provides noticeably smoother action during use.\u003c\/p\u003e\n\u003cp\u003eBuilt with components manufactured in Switzerland and assembled in Singapore, the PDG is approximately 20% lighter than the original Leveridge gauge—reducing hand fatigue during extended bench sessions without sacrificing accuracy. Measurements are read directly from the dial in 0.1 mm increments across a full range of 0.0–23.0 mm, making it suitable for a wide variety of gemstones, settings, and ring shanks.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePatented nonstick rack and pinion slide for smooth, consistent action\u003c\/li\u003e\n\u003cli\u003eApproximately 20% lighter than the original Leveridge gauge\u003c\/li\u003e\n\u003cli\u003eFunctions as a millimeter gauge, gem weight estimator, and ring size measure\u003c\/li\u003e\n\u003cli\u003eDial readout with 0.1 mm accuracy across the full measurement range\u003c\/li\u003e\n\u003cli\u003eIncludes high setting attachment for measuring raised or high-set stones\u003c\/li\u003e\n\u003cli\u003eComponents manufactured in Switzerland; assembled in Singapore\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eMeasurement Range\u003c\/th\u003e\n\u003ctd\u003e0.0–23.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAccuracy\u003c\/th\u003e\n\u003ctd\u003e0.1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMechanism\u003c\/th\u003e\n\u003ctd\u003ePatented nonstick rack and pinion slide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComponent Origin\u003c\/th\u003e\n\u003ctd\u003eSwitzerland\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAssembly\u003c\/th\u003e\n\u003ctd\u003eSingapore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePresidium Dial Gauge (PDG)\u003c\/li\u003e\n\u003cli\u003eProtective case\u003c\/li\u003e\n\u003cli\u003eReference booklet\u003c\/li\u003e\n\u003cli\u003eHigh setting attachment\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Presidium","offers":[{"title":"Default Title","offer_id":43581007462614,"sku":"135.197","price":209.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/presidium-dial-gauge-pdg-with-book-high-setting-attachment-otto-frei.jpg?v=1719957785"},{"product_id":"presidium-pegg-electronic-gemstone-gauge","title":"Presidium Electronic Gemstone Gauge PEGG With Book And Case","description":"\u003cp\u003eAn electronic gemstone gauge measures loose stones at the bench more finely than a dial gauge can. The Presidium Electronic Gemstone Gauge (PEGG) reads to \u003cstrong\u003e0.01 mm\u003c\/strong\u003e, ten times more accurate than analog dial-type gemstone gauges, which is a critical advantage when matching pairs from large lots of stones or verifying precise measurements in the trade.\u003c\/p\u003e\u003cp\u003eDesigned for diamond and gemstone dealers, bench jewelers, and anyone who demands exacting measurement standards, the PEGG provides a clear electronic LED readout. Whether you are sorting parcels, grading individual stones, or documenting inventory, this gauge delivers the sensitivity the job demands.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eElectronic LED readout for fast, clear measurement display\u003c\/li\u003e\n\u003cli\u003eReads to 0.01 mm precision\u003c\/li\u003e\n\u003cli\u003eTen times more accurate than analog dial-type gemstone gauges\u003c\/li\u003e\n\u003cli\u003eSuited to matching pairs from large lots of gemstones\u003c\/li\u003e\n\u003cli\u003eBuilt for diamond and gemstone dealers\u003c\/li\u003e\n\u003cli\u003eProtective case and instructional booklet included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eWhat you get:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePresidium Electronic Gemstone Gauge (PEGG)\u003c\/li\u003e\n\u003cli\u003eProtective carrying case\u003c\/li\u003e\n\u003cli\u003eInstructional booklet\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Presidium","offers":[{"title":"Default Title","offer_id":43581011001558,"sku":"135.195","price":383.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/presidium-electronic-gemstone-gauge-pegg-with-book-and-case-otto-frei.jpg?v=1686176607"},{"product_id":"presidium-gem-computer-gauge-pcgc","title":"Presidium Gem Computer Gauge PCGC","description":"\u003cp\u003eA gemstone gauge measures a stone at the bench and turns those measurements into an estimated weight, and this one does the arithmetic for you. The Presidium Gem Computer Gauge (PCGC) combines measurement, weight estimation, and identification in a single instrument, reading to 0.01 mm, ten times the resolution of a standard analog dial-style gauge. That makes it useful to diamond handlers, gemologists, and appraisers who measure, sort, and match loose or set stones.\u003c\/p\u003e\u003cp\u003eThe gauge works as a fully standalone tool: enter measurements on the onboard keypad to estimate gemstone weights and identify unknown stones. Connect it to a Windows PC with the included USB cable and the software suite on the included mini CD-ROM adds data for 59 more gemstones beyond the 74 built into the gauge, bringing the total to 133 gemstones across 9 shapes. The software also handles data manipulation and storage and lets you create weight estimation profiles for custom gemstone types.\u003c\/p\u003e\u003cp\u003eFurther functions include a Specific Gravity Dictionary that retrieves the S.G. value of any stored gemstone by name, a Gemstone Estimator that identifies unknown stones from entered measurements and weight, and a direct carat conversion for round brilliant cut diamonds. The Auto-Magnetic Power-Off feature activates on its own when the gauge is placed in its carrying case, preserving battery life.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMeasures to 0.01 mm resolution, ten times the accuracy of analog dial-style gemstone gauges\u003c\/li\u003e\n\u003cli\u003eWeight estimation software built into the gauge covers 74 gemstones and 9 shapes\u003c\/li\u003e\n\u003cli\u003eMini CD-ROM adds data for 59 additional gemstones, 133 in total, plus expanded data storage and manipulation tools\u003c\/li\u003e\n\u003cli\u003eComputes weight from direct measurement or manual keypad entry\u003c\/li\u003e\n\u003cli\u003eUSB interface for connection to Windows 2000 and later PCs\u003c\/li\u003e\n\u003cli\u003eDirect carat conversion for round brilliant cut diamonds\u003c\/li\u003e\n\u003cli\u003eSpecific Gravity Dictionary retrieves S.G. values by gemstone name\u003c\/li\u003e\n\u003cli\u003eGemstone Estimator identifies unknown stones from measurements and weight\u003c\/li\u003e\n\u003cli\u003eHardened measurement platform\u003c\/li\u003e\n\u003cli\u003eAuto-Magnetic Power-Off activates when the gauge is placed in its carrying case\u003c\/li\u003e\n\u003cli\u003eBattery operated, with one CR-2450 battery included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eWhat you get:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e1 Presidium Gem Computer Gauge (PCGC)\u003c\/li\u003e\n\u003cli\u003e1 high setting attachment\u003c\/li\u003e\n\u003cli\u003e1 USB cable\u003c\/li\u003e\n\u003cli\u003e1 mini CD-ROM with expanded gemstone software (133 total gemstones)\u003c\/li\u003e\n\u003cli\u003e1 instruction booklet\u003c\/li\u003e\n\u003cli\u003e1 CR-2450 battery\u003c\/li\u003e\n\u003cli\u003e1 storage and carrying case\u003c\/li\u003e\n\u003c\/ul\u003e\u003cul\u003e\n\u003cli\u003ePC software requires Windows 2000 or later, and the mini CD-ROM must be loaded separately to reach the expanded gemstone data and the advanced storage features\u003c\/li\u003e\n\u003cli\u003eAuto-Magnetic Power-Off is triggered by placing the gauge in its carrying case, with no manual power switch action needed\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Presidium","offers":[{"title":"Default Title","offer_id":43581098361046,"sku":"135.193","price":345.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/presidium-gem-computer-gauge-pcgc-otto-frei-1.jpg?v=1719957741"},{"product_id":"presidium-pdt-duo-tester-diamond-gemstone-identifier","title":"Presidium PDT Duo Tester-Identify Diamonds \u0026 Colored Stones","description":"\u003cp\u003eTest a stone two ways with one press of the button, so a diamond reading is confirmed before the piece leaves the bench. The \u003cstrong\u003ePresidium PDT Duo Tester\u003c\/strong\u003e combines two distinct testing methods into a single professional instrument, giving jewelers and gemologists the tools needed to accurately identify diamonds, diamond simulants including synthetic moissanite, and popular colored gemstones. Unlike a standard thermal tester alone, this unit simultaneously performs both thermal conductivity testing and digital reflectivity measurement through a single probe.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual testing technology:\u003c\/strong\u003e thermal conductivity testing and digital reflectivity measurement are performed simultaneously through the same testing probe with a single press of the test button\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDigital reflectivity meter:\u003c\/strong\u003e provides a numeric readout that cross-references with the included Simulant Reflectivity Chart to identify the stone based on its refractive index\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnalog needle thermal display:\u003c\/strong\u003e easy-to-read dial calibrated to indicate differences in thermal conductivity across popular gemstones and simulants; diamond readings fall in a clearly marked green zone, colored gemstones in labeled red zones\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoissanite detection:\u003c\/strong\u003e the reflectivity meter confirms or rules out synthetic moissanite, which shares the same thermal characteristics as diamond and cannot be distinguished by thermal testing alone\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorks on mounted and loose stones:\u003c\/strong\u003e the thermal probe tests both mounted and loose gemstones, and even coated stones can be accurately tested\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal warning detector:\u003c\/strong\u003e the thermal probe pen emits an audible buzz if the gem mounting is accidentally contacted during testing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in calibration standards:\u003c\/strong\u003e integrated diamond and simulant test discs for thermal tester calibration, plus a built-in diamond substitute set for reflectivity meter calibration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSample stone tray:\u003c\/strong\u003e slide-out tray with plastic cover holds seven calibration stones (YAG, Cubic Zirconia, Zircon, Strontium Titanate, GGG, Synthetic Spinel and Synthetic Sapphire), each approximately 5.0 mm in diameter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible power options:\u003c\/strong\u003e operates on 5 AA alkaline batteries or the included 120V AC adapter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-year factory warranty:\u003c\/strong\u003e each unit is tested for functionality before shipment\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eWhat you get:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePresidium PDT Duo Tester instrument\u003c\/li\u003e\n\u003cli\u003eThermal testing probe\u003c\/li\u003e\n\u003cli\u003eSimulant Reflectivity Chart\u003c\/li\u003e\n\u003cli\u003eBuilt-in diamond and simulant test discs\u003c\/li\u003e\n\u003cli\u003eBuilt-in diamond substitute set (7 calibration stones in slide-out tray with plastic cover)\u003c\/li\u003e\n\u003cli\u003e120V AC adapter\u003c\/li\u003e\n\u003cli\u003eAll stones identified as diamond by the thermal tester should also be tested with the reflectivity meter to rule out synthetic moissanite, as moissanite shares the same thermal conductivity as diamond.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Presidium","offers":[{"title":"Default Title","offer_id":43581433217238,"sku":"156.756","price":423.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/presidium-pdt-duo-tester-identify-diamonds-and-colored-stones-otto-frei-1.jpg?v=1719957558"},{"product_id":"presidium-gem-tester-ii-pgt-ii-thermal-gem-tester","title":"Presidium Gem Tester II","description":"\u003cp\u003eRead how fast a stone conducts heat and put a name to it at the bench, mounted or loose. The \u003cstrong\u003ePresidium Gem Tester II (PGT II)\u003c\/strong\u003e gives jewelers and gemologists fast, laboratory-proven answers to the questions that come up every day: diamond or moissanite, ruby or garnet, sapphire or tanzanite, emerald or jadeite. This professional-grade color stone estimator takes human error out of gem identification by measuring the rate at which each gemstone type conducts heat, a physical property unique to the stone.\u003c\/p\u003e\u003cp\u003eTouch the thermoelectric probe to the surface of a stone and the calibrated dial shows the relative heat conductivity of the material, allowing rapid identification across the most popular precious gemstone families. The PGT II is the latest generation of the Presidium Gem Tester and introduces an updated, easier-to-read display along with a new \u003cstrong\u003eDiamond\/Moissanite\u003c\/strong\u003e indicator. Because moissanite conducts heat at a rate identical to diamond, the updated dial alerts you when a stone falls within that range, signaling that additional visual testing is required to separate the two.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eMoissanite can be identified visually using a 10x loupe, as moissanite exhibits double refraction. Diamond does not.\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eIdentifies diamond and separates the most popular colored gemstones from one another\u003c\/li\u003e\n\u003cli\u003eUpdated display reads \u003cstrong\u003eDiamond\/Moissanite\u003c\/strong\u003e and alerts you when further visual testing is needed\u003c\/li\u003e\n\u003cli\u003eThermoelectric probe measures the heat conductivity unique to each gemstone type\u003c\/li\u003e\n\u003cli\u003eSolid-state probe pen requires \u003cstrong\u003eno warm-up time\u003c\/strong\u003e between tests\u003c\/li\u003e\n\u003cli\u003eBuilt-in \u003cstrong\u003emetal detector\u003c\/strong\u003e alerts you if the probe touches a metal mounting instead of the stone\u003c\/li\u003e\n\u003cli\u003eWorks on both mounted and loose stones\u003c\/li\u003e\n\u003cli\u003eTwo calibration test discs mounted directly into the unit frame\u003c\/li\u003e\n\u003cli\u003eLightweight and portable design\u003c\/li\u003e\n\u003cli\u003eDual power: two AA batteries or the included 110V AC adapter\u003c\/li\u003e\n\u003cli\u003e1-year factory warranty included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eThe Presidium Gem Tester II \u003cstrong\u003ecannot distinguish between diamond and moissanite\u003c\/strong\u003e by thermal conductivity alone, because both materials conduct heat at the same rate. When a stone tests in the Diamond\/Moissanite range, inspect it with a 10x loupe: moissanite displays double refraction under magnification and diamond does not.\u003c\/p\u003e","brand":"Presidium","offers":[{"title":"Default Title","offer_id":43581433807062,"sku":"156.750","price":314.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/presidium-gem-tester-ii-otto-frei-1.jpg?v=1719957557"},{"product_id":"presidium-pmut-iii-multi-tester-diamond-moissanite","title":"Presidium PMuT III Multi Tester","description":"\u003cp\u003eTell a diamond from moissanite, a diamond simulant, or cubic zirconia at the bench in a single test. The \u003cstrong\u003ePresidium PMuT III Multi Tester\u003c\/strong\u003e is a premium all-in-one instrument that combines thermal and electrical conductivity testing to identify diamonds, moissanite, diamond simulants, and cubic zirconia. Designed for professional jewelers who need fast, reliable stone identification, this tester delivers nearly instantaneous results through an intuitive color-coded LED indicator system and audible alerts, eliminating guesswork at the bench.\u003c\/p\u003e\u003cp\u003eSimply place the retractable probe against the stone to be tested. The visual indicator illuminates in one of four colors: \u003cstrong\u003eorange for metal\u003c\/strong\u003e, \u003cstrong\u003ered for simulant\u003c\/strong\u003e, \u003cstrong\u003eyellow for moissanite\u003c\/strong\u003e, and \u003cstrong\u003egreen for diamond\u003c\/strong\u003e. An intermittent beep sounds when metal is detected, while a confirmed diamond result produces a continuous beep for added certainty.\u003c\/p\u003e\u003cp\u003eThe PMuT III runs on three AAA batteries (not included) or an optional 110V AC adaptor.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCombines thermal and electrical conductivity testing in one instrument\u003c\/li\u003e\n\u003cli\u003eIdentifies diamonds, moissanite, diamond simulants, and cubic zirconia\u003c\/li\u003e\n\u003cli\u003eRetractable probe for safe, precise stone contact\u003c\/li\u003e\n\u003cli\u003eColor-coded LED results: orange (metal), red (simulant), yellow (moissanite), green (diamond)\u003c\/li\u003e\n\u003cli\u003eAudible alerts: intermittent beep for metal, continuous beep for diamond\u003c\/li\u003e\n\u003cli\u003eNear-instantaneous test results\u003c\/li\u003e\n\u003cli\u003ePowered by three AAA batteries or optional 110V AC adaptor\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eThe 110V AC adaptor is \u003cstrong\u003ehighly recommended\u003c\/strong\u003e for regular bench use. As a high-drain device, the PMuT III can deplete three AAA batteries in less than 2½ hours of continuous operation. Batteries are not included.\u003c\/p\u003e","brand":"Presidium","offers":[{"title":"Default Title","offer_id":43581434724566,"sku":"156.752","price":245.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/presidium-pmut-iii-multi-tester-otto-frei.jpg?v=1719957557"},{"product_id":"presidium-pdmt-a-diamondmate-diamond-tester","title":"Presidium PDMT-A DiamondMate Diamond Tester","description":"\u003cp\u003eScreen a stone for diamond in seconds, at the bench or across the counter on a purchase. The \u003cstrong\u003ePresidium PDMT-A DiamondMate\u003c\/strong\u003e is a handheld diamond tester that uses thermal conductivity to quickly separate diamonds from most known simulants. Compact and easy to use, it is built for jewelers, gemologists, and appraisers who need a dependable screening tool at the bench or in the field. The retractable probe tip promotes correct testing technique and extends tip life, while dual indicators—a continuous beep for diamond and an intermittent beep for metal contact—deliver clear, unambiguous results with no waiting time between tests.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDistinguishes diamonds from all known simulants except moissanite\u003c\/li\u003e\n\u003cli\u003eNo waiting time required between tests\u003c\/li\u003e\n\u003cli\u003eContinuous beep confirms positive diamond identification\u003c\/li\u003e\n\u003cli\u003eIntermittent beep indicates probe contact with metal\u003c\/li\u003e\n\u003cli\u003eVisual light indicator accompanies audible signals\u003c\/li\u003e\n\u003cli\u003eRetractable probe tip promotes accurate technique and extends tip life\u003c\/li\u003e\n\u003cli\u003eLow battery indicator alerts before power loss\u003c\/li\u003e\n\u003cli\u003eUp to 7 hours of continuous use per set of batteries\u003c\/li\u003e\n\u003cli\u003ePowered by 3 AAA batteries (not included) or optional 120V AC adapter\u003c\/li\u003e\n\u003cli\u003eFull one-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eWhat you get:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePresidium PDMT-A DiamondMate tester\u003c\/li\u003e\n\u003cli\u003eCarrying case\u003c\/li\u003e\n\u003cli\u003eDetailed instructions\u003c\/li\u003e\n\u003c\/ul\u003e\u003cul\u003e\n\u003cli\u003eMoissanite shares the same thermal conductivity as diamond and will be identified as diamond by this tester.\u003c\/li\u003e\n\u003cli\u003eTo differentiate moissanite from diamond, a moissanite-specific tester or multi-function tester is required.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Presidium","offers":[{"title":"Default Title","offer_id":43581436887254,"sku":"156.751","price":122.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/presidium-pdmt-a-diamondmate-diamond-tester-otto-frei.jpg?v=1719957558"},{"product_id":"presidium-pgi-gem-indicator-colored-stone-tester-31-gems","title":"Presidium PGI Gem Indicator","description":"\u003cp\u003ePut a name to a colored stone at the bench instead of sending it out. The \u003cstrong\u003ePresidium Gem Indicator (PGI)\u003c\/strong\u003e is the only handheld tester specifically designed for colored gemstones. Using advanced thermal conductivity technology, it can identify up to 31 different gem types and includes a color input function with 12 common gemstone colors for even greater accuracy. A clear digital LED screen ensures easy-to-read results, while the patented changeable probe tip delivers reliable, long-term performance.\u003c\/p\u003e\u003cp\u003eThe PGI is a convenient, handheld upgrade from the popular Presidium PGT\/CSE Gem Tester, combining proven accuracy with enhanced portability.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDifferentiates diamonds from other colored gemstones\u003c\/li\u003e\n\u003cli\u003eIdentifies up to 31 gemstone types\u003c\/li\u003e\n\u003cli\u003eColor input function with 12 color choices for improved precision\u003c\/li\u003e\n\u003cli\u003eThinner 0.45mm retractable probe tests stones as small as 0.2 ct\u003c\/li\u003e\n\u003cli\u003eChangeable probe tip for extended service life\u003c\/li\u003e\n\u003cli\u003eBuilt-in metal alert buzzer\u003c\/li\u003e\n\u003cli\u003eLow battery indicator\u003c\/li\u003e\n\u003cli\u003eInternal gemstone database with color references\u003c\/li\u003e\n\u003cli\u003eUSB connection for firmware and software updates\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eBatteries are not included. Work in a stable ambient temperature of 73–80°F (23–27°C) for the most consistent readings.\u003c\/p\u003e","brand":"Presidium","offers":[{"title":"Default Title","offer_id":43582261035222,"sku":"156.750PGI","price":368.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/presidium-pgi-gem-indicator-otto-frei-1.jpg?v=1719957145"},{"product_id":"presidium-ps2-2-replacement-probe-pen-pgt-ii-pdt-ii","title":"Replacement Probe Pen PS2-2 for Presidium PGT II and PDT II","description":"\u003cp\u003eThe Replacement Probe Pen PS2-2 is a genuine titanium probe pen designed as a direct replacement for the Presidium Gem Tester II (PGT II) and Presidium Duo Tester II (PDT II). If your original probe pen has been lost or damaged, this replacement restores your instrument to full working condition without the need to replace the entire unit.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine replacement probe pen for Presidium PGT II and PDT II instruments\u003c\/li\u003e\n\u003cli\u003eTitanium construction for durability and precise contact\u003c\/li\u003e\n\u003cli\u003eRestores full functionality to your Presidium gem testing instrument\u003c\/li\u003e\n\u003cli\u003eDirect fit — no modification required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003ctd\u003ePS2-2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eTitanium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Instruments\u003c\/th\u003e\n\u003ctd\u003ePresidium Gem Tester II (PGT II), Presidium Duo Tester II (PDT II)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003ePresidium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e This probe pen is designed for use only with the Presidium Gem Tester II (PGT II) and Presidium Duo Tester II (PDT II). It is not compatible with other Presidium models or third-party instruments.\u003c\/p\u003e","brand":"Presidium","offers":[{"title":"Default Title","offer_id":43742251745494,"sku":"156.746","price":74.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/replacement-probe-pen-ps2-2-for-presidium-pgt-ii-and-pdt-ii-otto-frei.jpg?v=1719954675"},{"product_id":"presidium-stone-rest-3-size-gem-testing","title":"Presidium Stone Rest","description":"\u003cp\u003eThe \u003cstrong\u003ePresidium Stone Rest\u003c\/strong\u003e is a testing accessory designed to hold loose stones securely while you work with Presidium gemstone testers. By keeping stones stable in the rest during testing, you ensure consistent contact and more reliable results. The stone rest accommodates three sizes, making it versatile for a range of stone dimensions commonly encountered in gem testing and identification workflows.\u003c\/p\u003e\u003cp\u003eWhen using Presidium testers with stones placed in the rest, it is important to keep your hand on the stone rest throughout the testing process.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDesigned specifically for use with Presidium gemstone testers\u003c\/li\u003e\n\u003cli\u003eHolds loose stones securely during testing for consistent, reliable results\u003c\/li\u003e\n\u003cli\u003eAccommodates three stone sizes in a single accessory\u003c\/li\u003e\n\u003cli\u003eHelps maintain proper hand placement technique during testing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Use\u003c\/th\u003e\n\u003ctd\u003eFor use with Presidium gemstone testers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStone Sizes Accommodated\u003c\/th\u003e\n\u003ctd\u003e3 sizes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVariant Count\u003c\/th\u003e\n\u003ctd\u003e1 (single configuration)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"Presidium","offers":[{"title":"Default Title","offer_id":44191483232470,"sku":"156.745","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/presidium-stone-rest-otto-frei.jpg?v=1719954211"},{"product_id":"presidium-oti-diamond-tester-optical-thermal","title":"Presidium OTI All-In-One Diamond Tester","description":"\u003cp\u003eConfirm what a stone is before you buy it, set it or quote a repair on it. The \u003cstrong\u003ePresidium OTI All-In-One Diamond Tester\u003c\/strong\u003e combines dual \u003cem\u003eoptical\u003c\/em\u003e and \u003cem\u003ethermal\u003c\/em\u003e testing technology into a single probe, delivering fast, reliable diamond authentication for professional jewelers and gemologists. This versatile instrument distinguishes natural diamonds from lab-grown diamonds, moissanite and common simulants such as glass, sapphire and cubic zirconia, whether the stone is loose or mounted in a jewelry setting. A resistive touchscreen interface, an ergonomic form factor and a replaceable probe make it a tool built for daily professional use in bench or retail environments.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDual optical and thermal testing technology combined in a single probe\u003c\/li\u003e\n\u003cli\u003eIdentifies natural diamonds versus lab-grown diamonds, moissanite and common simulants (glass, sapphire, CZ)\u003c\/li\u003e\n\u003cli\u003eTests both loose and mounted stones across all jewelry settings\u003c\/li\u003e\n\u003cli\u003eReplaceable probe reduces downtime and extends the working life of the unit\u003c\/li\u003e\n\u003cli\u003eClear resistive touchscreen display with 6-language interface\u003c\/li\u003e\n\u003cli\u003eErgonomic, portable design suited for bench and point-of-sale use\u003c\/li\u003e\n\u003cli\u003eUser-safe UV light function shuts off automatically when not in use\u003c\/li\u003e\n\u003cli\u003eAuto shutdown and low-battery indicator for uninterrupted workflow\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eTests colorless polished diamonds with a minimum table width of 1.6 mm, loose or mounted in any jewelry setting.\u003c\/p\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eBatteries are not included. Run the OTI on three AAA lithium batteries, rechargeable or non-rechargeable, or from a USB power bank, and expect up to 1.5 hours of continuous use per charge or set.\u003c\/p\u003e","brand":"Presidium","offers":[{"title":"Default Title","offer_id":45904574054614,"sku":"156.738","price":1565.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/156.738_thumb_c3132faa-2d63-4939-9ac5-d2ba7a3ab7c7.jpg?v=1721161214"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/collections\/presidium-logo.png?v=1785815944","url":"https:\/\/www.ottofrei.com\/ja\/collections\/presidium-gem-testers-gauges.oembed","provider":"Otto Frei","version":"1.0","type":"link"}