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Oscar Heyman Brothers ruby and diamond half eternity ring. Set with four round brilliant cut diamonds in open back channel settings with a combined approximate weight of 0.16 carats, alternating with five round brilliant cut natural unenhanced rubies in open back channel settings with a combined approximate weight of 0.27 carats, all to a smoothly conforming half eternity band with intricately pierced square backholing, approximately 2.9 mm in width. Marked platinum and iridium, maker's mark for Oscar Heyman Brothers, numbered 'G7503', American, circa 1970.