A 14K YELLOW GOLD, BLACK OPAL AND DIAMOND BROOCH. Centering black opal cabochon measuring approximately 25.00 mm. by 15.80 mm. , set in stylized frame accented with old European-cut and old mine-cut diamonds. Approximate diamond wt.: 1.75 cts. 3 3/4 in. by 2 in. Estimate $3,000-4,000