PERIOD OPAL AND DIAMOND RING CA. 1910-1920: 14K yellow gold ring contains 8 early old European round cut diamonds (2 diamonds are chipped). Weight: 1.00 Ct. Approx. The diamonds average VS-SI in clarity and I-J in color. At the center is a round 4.00 mm cabochon cut semi-crystal opal . Blue/green with red/orange play-of-color. Brightness: 1.5 (may improve with re-polishing). The diamonds are prong set. The opal is prong and glue set. Weight: 2.3 grams. Size: 7