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Oscar Heyman Brothers cat's eye chrysoberyl and diamond ring. Set with thirteen round cabochon cat’s eye chrysoberyls in open back claw settings with an approximate combined weight of 10.00 carats, further set with a central ring of six round brilliant cut diamonds in open back rubover settings with a total weight of 0.18 carats, and with an outer ring of six round brilliant cut diamonds in open back claw settings with a total weight of 0.80 carats. The total approximate diamond weight is 0.98 carats, to a circular bombé cluster design featuring curving claws, a pierced gallery and open backholing, leading to raised split shoulders which flow through to a ribbed D-shape shank. Marked platinum, maker’s mark for Oscar Heyman Brothers, numbered '50481', American, circa 1954, accompanied by Oscar Heyman Brothers authenticity certificate.