{"product_id":"cushion-buff-top-double-bevel-black-onyx-cabochons","title":"Onyx noir véritable taille coussin, dessus bombé, double biseau","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 characteristic deep, lustrous black color. Black Onyx is the top-selling chalcedony in the market and has a rich history in jewelry, most notably as a staple of Art Deco design.\u003c\/p\u003e\u003cp\u003eThese cushion buff top double bevel cabochons feature a uniform opaque black finish, making them well-suited for a wide range of jewelry settings. Clean with warm, soapy water. Use of an ultrasonic or steam cleaner is generally considered safe for these stones.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGenuine black onyx (dyed black chalcedony)\u003c\/li\u003e\n\u003cli\u003eCushion buff top with double bevel profile\u003c\/li\u003e\n\u003cli\u003eUniform opaque black color throughout\u003c\/li\u003e\n\u003cli\u003eChemically dyed treatment for consistent, rich black appearance\u003c\/li\u003e\n\u003cli\u003eSafe for ultrasonic and steam cleaning\u003c\/li\u003e\n\u003cli\u003eSuitable for resale and finished jewelry use\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\u003eComposition\u003c\/th\u003e\n\u003ctd\u003eMicrocrystalline quartz (chalcedony)\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\u003eShape\u003c\/th\u003e\n\u003ctd\u003eCushion buff top, double bevel\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\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-421\u003c\/td\u003e\n\u003ctd\u003e9x7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-423\u003c\/td\u003e\n\u003ctd\u003e14x12mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-424\u003c\/td\u003e\n\u003ctd\u003e16x12mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"Otto Frei","offers":[{"title":"9x7mm","offer_id":47551856246998,"sku":"947-421","price":3.48,"currency_code":"USD","in_stock":true},{"title":"14x12mm","offer_id":47551856279766,"sku":"947-423","price":4.32,"currency_code":"USD","in_stock":true},{"title":"16x12mm","offer_id":47551856312534,"sku":"947-424","price":5.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/cushion-buff-top-double-bevel-genuine-black-onyx-otto-frei.jpg?v=1719954479","url":"https:\/\/www.ottofrei.com\/fr\/products\/cushion-buff-top-double-bevel-black-onyx-cabochons","provider":"Otto Frei","version":"1.0","type":"link"}