{"product_id":"presidium-gem-tester-ii-pgt-ii-thermal-gem-tester","title":"Presidium Gem Tester II","description":"\u003cp\u003eIs it a diamond or moissanite? Ruby or garnet? Sapphire or tanzanite? Emerald or jadeite? The \u003cstrong\u003ePresidium Gem Tester II (PGT II)\u003c\/strong\u003e provides fast, laboratory-proven answers for jewelers and gemologists working with both mounted and loose stones. This professional-grade color stone estimator eliminates human error in gem identification by measuring the rate at which different gemstones conduct heat — a physical property unique to each stone type.\u003c\/p\u003e\u003cp\u003eSimply touch the sophisticated thermoelectric probe to the surface of any stone, and the specially calibrated dial displays the relative heat conductivity of the material, allowing for 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 an important new \u003cstrong\u003eDiamond\/Moissanite\u003c\/strong\u003e indicator. Because moissanite conducts heat at a rate identical to diamond, the updated dial now alerts the user when a stone falls within that range — signaling that additional visual testing is required to distinguish between 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 now reads \u003cstrong\u003eDiamond\/Moissanite\u003c\/strong\u003e — alerts user when further visual testing is needed\u003c\/li\u003e\n\u003cli\u003eThermoelectric probe measures 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 user 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: operates on two AA batteries or included 110V AC adapter\u003c\/li\u003e\n\u003cli\u003e1-year factory warranty included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003ePower Source\u003c\/th\u003e\n\u003ctd\u003eTwo (2) AA 1.5V batteries or 110V AC adapter (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProbe Type\u003c\/th\u003e\n\u003ctd\u003eSolid-state thermoelectric probe — no warm-up required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCalibration\u003c\/th\u003e\n\u003ctd\u003eTwo test discs mounted in frame\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMetal Detection\u003c\/th\u003e\n\u003ctd\u003eBuilt-in metal detector alerts when probe contacts metal mounting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd\u003e1-year factory warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eReturn Policy\u003c\/th\u003e\n\u003ctd\u003eOtto Frei 30-day satisfaction guaranteed return policy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\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, as both materials conduct heat at the same rate. When a stone tests in the Diamond\/Moissanite range, visual inspection with a 10x loupe is recommended. Moissanite displays double refraction under magnification; 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","url":"https:\/\/www.ottofrei.com\/products\/presidium-gem-tester-ii-pgt-ii-thermal-gem-tester","provider":"Otto Frei","version":"1.0","type":"link"}