OPAL & DIAMOND RING: 14K yellow gold ring centering one round cabochon cut gray opal, approx. 2.50 Ct. with a Blue/Green play-of-color and Brightness rating of 2.5. The 18 round full cut diamonds total approx. .25 Ct. Rated I1 in clarity and I-J in color. The opal and diamonds are prong set. Weight: 3.5 grams. Size: 7.25