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Crystal opal and diamond cluster ring. Set to centre with an oval cabochon natural unenhanced crystal opal in an open back grain setting, with an approximate weight of 3.30 carats, encircled and flanked by thirty round single cut diamonds in open back grain settings with a combined approximate weight of 0.30 carats, to a stylish coronet cluster design with millegrain borders, decorative open linear gallery and pierced geometric backholing, the squared shoulders gently curve to a solid D-shape shank. Tested platinum, English, circa 1920.