14 Karat Yellow Gold Opal "Doublet" and Diamond Ring in Leaf Setting Vintage 18K Yellow Gold Opal Ring Size 6.5 #15380 For Sale at 1stDibs Yellow Gold Opal White Sapphire and Kyanite Ring at 1stDibs 14k Yellow Gold Opal Diamond Ring For Sale at 1stDibs. Pre owned 10 karat yellow gold ring featuring extending prongs and single oval opal at center. Details: Colour: Gold Multi Materials: 10K Yellow Gold, Opal Condition: As is Hairline scratches throughout, chip under opal, crack across opal. Size: 5