Black opal and diamond cluster ring. Set to centre with an oval cabochon natural unenhanced black opal in an open back claw setting with an approximate weight of 13.00 carats, flanked by two rectangular baguette cut diamonds in open back rubover settings with a combined approximate weight of 0.70 carats, further enhanced by twenty six round mixed old cut diamonds in open back grain settings with a combined weight of 0.50 carats. The total approximate diamond weight is 1.20 carats, to an impressive cluster with curving claws, polished borders, a structured linear gallery and intricate open backholing, the raised trumpeting shoulders lead down to a solid D-shape shank. Tested platinum, circa 1925.
The play of colour in this opal is outstanding.