Opal Cabochon Antiqued Ring, Sterling Silver, 12k Rose and Green Gold Black Hills Motif, Size 10.5 .54 Carat Opal is Contrasted by Black Enamel Antiquing Hand Placed and Hand Engraved 12k Rose Gold and 12k Green Gold Grape Leaves Sterling Silver Ring Black Hills Gold Motif Ring Measures 9.91Millimeters x 21.59Millimeters Onyx Ring Measures .39 Inches High by .85 Inches Wide Comes with a Certificate of Authenticity, Made in the USA and Manufacturer's Lifetime Warranty against Defects in Materials and Workmanship