{"product_id":"cushion-flat-top-single-bevel-black-onyx-cabochons-12-16mm","title":"Cushion 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 exceptionally rare; virtually all black chalcedony on the market is grey chalcedony that has been chemically treated to achieve its deep, uniform black color. Black Onyx is the top-selling chalcedony in the gemstone market and has a rich history as a staple of Art Deco jewelry design.\u003c\/p\u003e\n\u003cp\u003eThese cushion flat top single bevel cabochons offer a classic shape well-suited for rings, pendants, brooches, and other settings requiring a polished, opaque stone with clean lines. Each stone presents a uniform opaque black appearance ideal for both contemporary and vintage-inspired metalwork.\u003c\/p\u003e\n\u003cp\u003eClean with warm, soapy water. Use of an ultrasonic or steam cleaner is generally considered safe for these stones.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine black onyx cabochons — dyed black chalcedony\u003c\/li\u003e\n\u003cli\u003eCushion flat top, single bevel cut for versatile setting options\u003c\/li\u003e\n\u003cli\u003eUniform opaque black color throughout\u003c\/li\u003e\n\u003cli\u003eTreatment: Dyed\u003c\/li\u003e\n\u003cli\u003eSafe to clean with warm soapy water; ultrasonic and steam cleaning generally safe\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eStone Type\u003c\/th\u003e\n\u003ctd\u003eGenuine Black Onyx (Dyed Black Chalcedony)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCut\u003c\/th\u003e\n\u003ctd\u003eCushion Flat Top, Single 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\u003c\/table\u003e\n\u003ch3\u003eAvailable Options\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003ePart #\u003c\/th\u003e\n\u003cth\u003eStone Size\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-402\u003c\/td\u003e\n\u003ctd\u003e12 mm x 10 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-403\u003c\/td\u003e\n\u003ctd\u003e14 mm x 12 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-404\u003c\/td\u003e\n\u003ctd\u003e16 mm x 12 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"Otto Frei","offers":[{"title":"12mmx10mm","offer_id":43834357940438,"sku":"947-402","price":8.5,"currency_code":"USD","in_stock":false},{"title":"14mmx12mm","offer_id":43834357973206,"sku":"947-403","price":6.1,"currency_code":"USD","in_stock":false},{"title":"16mmx12mm","offer_id":43834358005974,"sku":"947-404","price":6.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/cushion-flat-top-single-bevel-genuine-black-onyx-otto-frei.jpg?v=1719954518","url":"https:\/\/www.ottofrei.com\/products\/cushion-flat-top-single-bevel-black-onyx-cabochons-12-16mm","provider":"Otto Frei","version":"1.0","type":"link"}