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Oscar Heyman sapphire eternity ring. Set with twenty five rectangular baguette cut natural unenhanced sapphires in open back rubover channel settings with a combined approximate weight of 7.37 carats, to a smoothly conforming full eternity band with polished borders and geometric pierced backholing, approximately 6mm in width. Marked 18 carat yellow gold, maker's mark for Oscar Heyman Brothers, numbered 'K4414', American, circa 1970.