Edwardian Black Opal, Diamond, Platinum, Gold Necklace, J.E. Caldwell & Co. The necklace features a pear-shaped black opal cabochon measuring 18.00 x 12.00 x 4.70 mm, set in gold, enhanced by European and full-cut diamonds weighing a total of approximately 0.45 carat, set in platinum, marked JEC & Co. for J.E. Caldwell & Co.
Opal Pendant with Diamonds in 14k Gold. A 5.25 Carat Coober Pedy Light / White Opal oval in shape with Red and Blue colors and surrounded by two rows of diamonds. Ready to ship in Yellow Gold or can be made in White or Rose Gold. Or the opal can be set into a different pendant or ring setting.