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Oscar Heyman Bros. diamond twist eternity ring. Set with thirty round brilliant cut diamonds in open back grain settings with a combined approximate weight of 0.89 carats, to a smoothly conforming eternity band featuring a repeating twist pattern around the full circumference, each twist framed by polished borders, the inner decorated with fine engraving and intricate geometric backholing, approximately 3.2mm in width. Marked platinum and iridium, maker's mark for Oscar Heyman Brothers, numbered 'W1574',American, circa 1960.