Round Opal cabochon 14k gold ring. For Sale at 1stDibs Lot 10K YELLOW GOLD OPAL CABOCHON & DIAMOND RING Lot 10K Yellow Gold Opal Cabochon 3 Tier Ring Customizable 14kt solid gold ring with opal cabochon For Sale at 1stDibs. 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!