{"product_id":"genuine-black-onyx-cabochon-antique-buff-top-double-bevel","title":"Antique Buff Top Double 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 exceptionally rare — virtually all black chalcedony on the market is grey chalcedony that has been chemically treated to achieve its rich, uniform black color. Black Onyx is the top-selling chalcedony in the market and has a long history in fine jewelry, most notably as a staple of Art Deco design. These genuine cabochons feature an antique buff top with a double bevel profile, making them well suited for rings, pendants, brooches, and other classic settings.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine black onyx cabochons — not synthetic or simulated\u003c\/li\u003e\n\u003cli\u003eAntique buff top with double bevel cut for a refined, classic profile\u003c\/li\u003e\n\u003cli\u003eUniform opaque black color throughout\u003c\/li\u003e\n\u003cli\u003eDyed black chalcedony — industry-standard treatment for this stone type\u003c\/li\u003e\n\u003cli\u003eSuitable for use in Art Deco-inspired and traditional jewelry designs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eStone Type\u003c\/th\u003e\n\u003ctd\u003eBlack Onyx (Black Chalcedony)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCut\u003c\/th\u003e\n\u003ctd\u003eAntique Buff Top, Double Bevel\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\u003eTreatment\u003c\/th\u003e\n\u003ctd\u003eDyed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTransparency\u003c\/th\u003e\n\u003ctd\u003eOpaque\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCare\u003c\/th\u003e\n\u003ctd\u003eClean with warm, soapy water; ultrasonic and steam cleaning are generally safe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eAvailable Options\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003ePart #\u003c\/th\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-122\u003c\/td\u003e\n\u003ctd\u003e12x10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-123\u003c\/td\u003e\n\u003ctd\u003e14x12mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-124\u003c\/td\u003e\n\u003ctd\u003e16x12mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003eAs with all dyed stones, avoid prolonged exposure to harsh chemicals or abrasives that may affect the surface treatment. Ultrasonic and steam cleaning are generally considered safe for black onyx, though care should always be taken with set stones.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"12x10mm","offer_id":47551855722710,"sku":"947-122","price":3.9,"currency_code":"USD","in_stock":true},{"title":"14x12mm","offer_id":47551855755478,"sku":"947-123","price":5.0,"currency_code":"USD","in_stock":true},{"title":"16x12mm","offer_id":47551855788246,"sku":"947-124","price":6.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/antique-buff-top-double-bevel-genuine-black-onyx-otto-frei.jpg?v=1719954480","url":"https:\/\/www.ottofrei.com\/products\/genuine-black-onyx-cabochon-antique-buff-top-double-bevel","provider":"Otto Frei","version":"1.0","type":"link"}