{"product_id":"antique-flat-top-single-bevel-black-onyx-cabochons-12-16mm","title":"Antique Flat Top Single Bevel Genuine Black Onyx","description":"\u003cp\u003e\u003cstrong\u003eBlack Onyx, also known as black agate, is dyed black chalcedony.\u003c\/strong\u003e Chalcedony is composed of microscopic quartz crystals not visible to the naked eye. Natural black chalcedony is exceedingly rare — virtually all black chalcedony on the market is grey chalcedony that has been chemically treated to achieve its characteristic deep, shiny black color. Black Onyx has long been one of the top-selling chalcedony gemstones and was a hallmark material in Art Deco jewelry design. These antique flat top, single bevel cabochons offer a classic profile well suited for rings, pendants, and statement pieces requiring a bold, uniform black stone.\u003c\/p\u003e\u003cp\u003eCare is straightforward: clean with warm, soapy water. Use of an ultrasonic or steam cleaner is generally considered safe for this material.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAntique flat top with single bevel profile\u003c\/li\u003e\n\u003cli\u003eGenuine black onyx (dyed black chalcedony)\u003c\/li\u003e\n\u003cli\u003eUniform opaque black color throughout\u003c\/li\u003e\n\u003cli\u003eDyed treatment for consistent, deep black appearance\u003c\/li\u003e\n\u003cli\u003eSuitable for a variety of jewelry settings and metalsmithing applications\u003c\/li\u003e\n\u003cli\u003eSafe for ultrasonic and steam cleaning\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eStone Type\u003c\/th\u003e\n\u003ctd\u003eBlack Onyx (Dyed Black Chalcedony)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProfile\u003c\/th\u003e\n\u003ctd\u003eAntique Flat Top, Single Bevel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTreatment\u003c\/th\u003e\n\u003ctd\u003eDyed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eUniform Opaque Black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition\u003c\/th\u003e\n\u003ctd\u003eMicrocrystalline Quartz (Chalcedony)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCare\u003c\/th\u003e\n\u003ctd\u003eWarm soapy water; ultrasonic and steam cleaning generally safe\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\u003eSize\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-132\u003c\/td\u003e\n\u003ctd\u003e12x10mm\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-133\u003c\/td\u003e\n\u003ctd\u003e14x12mm\u003c\/td\u003e\n\u003ctd\u003eIncludes hole for diamond setting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-134\u003c\/td\u003e\n\u003ctd\u003e16x12mm\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"Otto Frei","offers":[{"title":"12x10mm","offer_id":47551766364374,"sku":"947-132","price":7.0,"currency_code":"USD","in_stock":true},{"title":"14x12mm","offer_id":47551766397142,"sku":"947-133","price":8.0,"currency_code":"USD","in_stock":true},{"title":"16x12mm","offer_id":47551766429910,"sku":"947-134","price":9.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/antique-flat-top-single-bevel-genuine-black-onyx-otto-frei.jpg?v=1719954651","url":"https:\/\/www.ottofrei.com\/products\/antique-flat-top-single-bevel-black-onyx-cabochons-12-16mm","provider":"Otto Frei","version":"1.0","type":"link"}