{"product_id":"octagon-buff-top-single-bevel-black-onyx-cabochons-9x7-16x12mm","title":"Octagon Buff Top Single Bevel Genuine Black Onyx","description":"\u003cp\u003e\u003cstrong\u003eBlack onyx, also known as black agate, is dyed black chalcedony\u003c\/strong\u003e — one of the most enduring and versatile gem materials in the jeweler's palette. Chalcedony is composed of microscopic quartz crystals invisible to the naked eye. Natural black chalcedony is exceptionally rare; as a result, all black chalcedony on the market is grey chalcedony that has been chemically treated to achieve its signature deep, uniform black color. Black onyx remains the top-selling chalcedony in the trade and carries a rich history in jewelry design, most notably as a staple of the Art Deco movement.\u003c\/p\u003e\u003cp\u003eThese octagon buff top cabochons feature a single bevel cut and a polished, opaque black surface that photographs beautifully and pairs well with both white and yellow metals. Ideal for rings, pendants, brooches, and earrings across a range of jewelry styles.\u003c\/p\u003e\u003cp\u003eClean with warm, soapy water. Use of ultrasonic and steam cleaners is generally considered safe for this material.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGenuine black onyx (dyed black chalcedony)\u003c\/li\u003e\n\u003cli\u003eOctagon buff top with single bevel profile\u003c\/li\u003e\n\u003cli\u003eUniform opaque black color throughout\u003c\/li\u003e\n\u003cli\u003eSmooth, polished cabochon surface\u003c\/li\u003e\n\u003cli\u003eTreatment: Dyed — industry-standard process for all black chalcedony\u003c\/li\u003e\n\u003cli\u003eHistorically significant gem material associated with Art Deco jewelry design\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\u003eCut Style\u003c\/th\u003e\n\u003ctd\u003eOctagon Buff 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\u003ctr\u003e\n\u003cth\u003eCleaning\u003c\/th\u003e\n\u003ctd\u003eWarm soapy water; ultrasonic and steam 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-F11\u003c\/td\u003e\n\u003ctd\u003e9x7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-F12\u003c\/td\u003e\n\u003ctd\u003e12x10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-F13\u003c\/td\u003e\n\u003ctd\u003e14x12mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-F14\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":47551856705750,"sku":"947-F11","price":3.0,"currency_code":"USD","in_stock":true},{"title":"12x10mm","offer_id":47551856738518,"sku":"947-F12","price":4.92,"currency_code":"USD","in_stock":true},{"title":"14x12mm","offer_id":47551856771286,"sku":"947-F13","price":6.0,"currency_code":"USD","in_stock":true},{"title":"16x12mm","offer_id":47551856804054,"sku":"947-F14","price":6.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/octagon-buff-top-single-bevel-genuine-black-onyx-otto-frei.jpg?v=1719954479","url":"https:\/\/www.ottofrei.com\/products\/octagon-buff-top-single-bevel-black-onyx-cabochons-9x7-16x12mm","provider":"Otto Frei","version":"1.0","type":"link"}