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Oscar Heyman Bros pink sapphire and diamond ring. Set with six round brilliant cut diamonds in open back claw settings with a combined approximate weight of 0.46 carats, further set with six marquise shape brilliant cut natural unenhanced pink sapphires in open back claw settings with a combined approximate weight of 1.21 carats, to an intricate double row cluster with fancy pierced backholing, followed by trumpeting split shoulders leading to a double ridged solid shank. Marked platinum and iridium, maker's mark for Oscar Heyman Brothers, numbered '2093', American, circa 1970.