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Edwardian black opal diamond ring. Centrally set with an oval cabochon natural unenhanced black opal in an open back claw setting with an approximate weight of 1.75 carats, encircled by a single row of twenty round old cut diamonds in open back rubover and grain settings, with a combined approximate weight of 0.60 carats, to a elongated coronet cluster featuring fine curving claws, subtle millegrain borders, scalloped edging, intricately pierced open gallery and fancy shaped backholing, flanked to either side with trumpeting split open shoulders which terminate to gently recessed ribbing before smoothing to a slim shank. Tested yellow gold with platinum settings, English, circa 1905.