Lot 10K YELLOW GOLD OPAL CABOCHON & DIAMOND RING 10K Gold and Opal Cabochon Ring Vintage 14K White Gold Diamond Black Opal Cabochon Ring For Sale at 1stDibs Lot Vintage retro modern 10K gold cabochon opal ring in freeform. Size 7. 5 Materials: 10K gold, opal Condition: excellent Box shown for display purposes only, not included nor for sale, but ring will ship in a lovely new cushioned ring box that is perfectly suited for presentation. More Vintage & Antique Jewelry here. Select ShopPay at checkout and pay in 4 interest free installments but receive your item straight away!