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Black opal and diamondcluster ring. Set to centre with an oval cabochonnatural unenhanced black opal in an open backclaw 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-shapeshank. Testedplatinum, circa 1925.