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Oscar Heyman Brothers ruby and diamond eternity ring. Set with fourteen round brilliant cut natural unenhanced rubies in open back rubover settings with a combined approximate weight of 0.84 carats, alternating with fourteen round brilliant cut diamonds in open back rubover settings with a combined approximate weight of 0.54 carats, all to a smoothly conforming full eternity band with pierced backholing, approximately 3.1mm in width. Marked 18 carat yellow gold, maker's mark for Oscar Heyman Brothers, numbered 'P540', American, circa 1970.