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Cat's eye chrysoberyl and diamond ring by Oscar Heyman Bros. Set with thirteen round cabochon cat’s eye chrysoberyls in open back claw settings with an approximate total weight of 10.00 carats, with a central ring of six round brilliant cut diamonds in open back rubover collet 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 approximate combined diamond weight is 0.98 carats, to a circular bombé bezel with pierced gallery, open backholing and on 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.