18K CRYSTAL OPAL CABOCHON AND DIAMOND RING: 18K yellow gold ring with 24 round brilliant cut diamonds, approx. .75CTW, rated VS in clarity and H in color, centering an oval shaped cabochon cut opal measuring approx. 15.00 x 12.00 x 4.90 mm. Weight: 3.50 Ct. Approx. Translucent with grey body-color. Blue/green play-of-color. Very slightly crazed. The opal and diamonds are prong set. Weight: 8.1 grams. Size 5 ¼