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Oscar Heyman Brothers sapphire ring. Set with four channel set tapered rows of calibre cut natural unenhanced sapphires in open back rubover settings, sixteen in total with an approximate combined weight of 2.64 carats, to a yellow gold and platinum heavy twist solid band. Marked 18 carat yellow gold and platinum, maker's mark for Oscar Heyman Brothers, numbered 'M2843', American, circa 1970.