{"product_id":"round-black-onyx-cabochon-4-18mm","title":"Round Black Onyx Cabochon","description":"\u003cp\u003e\u003cstrong\u003eBlack Onyx, also known as black agate, is dyed black chalcedony.\u003c\/strong\u003e Chalcedony is composed of tiny 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 distinctive, uniform shiny black color. Black Onyx is the top-selling chalcedony in the jewelry market and has a rich history as a staple of Art Deco jewelry design.\u003c\/p\u003e\u003cp\u003eThese round cabochons feature a clean, opaque black appearance that pairs well with a wide range of metal types and setting styles, making them a versatile choice for professional jewelers and metalsmiths.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eUniform opaque black color throughout\u003c\/li\u003e\n\u003cli\u003eDyed black chalcedony (grey chalcedony treated to achieve black coloration)\u003c\/li\u003e\n\u003cli\u003eRound cabochon cut\u003c\/li\u003e\n\u003cli\u003eTreatment: Dyed\u003c\/li\u003e\n\u003cli\u003eClean with warm, soapy water; ultrasonic and steam cleaning are generally considered safe\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\u003eCut\u003c\/th\u003e\n\u003ctd\u003eRound Cabochon\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\u003eCare\u003c\/th\u003e\n\u003ctd\u003eWarm soapy water; ultrasonic and steam cleaning are 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-R04\u003c\/td\u003e\n\u003ctd\u003e4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-R06\u003c\/td\u003e\n\u003ctd\u003e6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-R08\u003c\/td\u003e\n\u003ctd\u003e8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-R10\u003c\/td\u003e\n\u003ctd\u003e10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-R12\u003c\/td\u003e\n\u003ctd\u003e12mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-R14\u003c\/td\u003e\n\u003ctd\u003e14mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-R16\u003c\/td\u003e\n\u003ctd\u003e16mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-R18\u003c\/td\u003e\n\u003ctd\u003e18mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"Otto Frei","offers":[{"title":"4mm","offer_id":47551787761878,"sku":"947-R04","price":0.9,"currency_code":"USD","in_stock":true},{"title":"6mm","offer_id":47551787794646,"sku":"947-R06","price":1.4,"currency_code":"USD","in_stock":false},{"title":"8mm","offer_id":47551787827414,"sku":"947-R08","price":1.5,"currency_code":"USD","in_stock":false},{"title":"10mm","offer_id":47551787860182,"sku":"947-R10","price":1.85,"currency_code":"USD","in_stock":false},{"title":"12mm","offer_id":47551787892950,"sku":"947-R12","price":2.55,"currency_code":"USD","in_stock":false},{"title":"14mm","offer_id":47551787925718,"sku":"947-R14","price":4.2,"currency_code":"USD","in_stock":false},{"title":"16mm","offer_id":47551787958486,"sku":"947-R16","price":4.0,"currency_code":"USD","in_stock":true},{"title":"18mm","offer_id":47551787991254,"sku":"947-R18","price":6.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/round-black-onyx-cabochon-otto-frei.jpg?v=1719954635","url":"https:\/\/www.ottofrei.com\/ja\/products\/round-black-onyx-cabochon-4-18mm","provider":"Otto Frei","version":"1.0","type":"link"}