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Oscar Heyman Brothers ruby and diamond ring. Set with fifteen step cut natural unenhanced calibré rubies in open back channel settings with rubover borders and an approximate combined weight of 1.10 carats, further set with fifteen graduated round brilliant cut diamonds in open back grain settings with an approximate combined weight of 0.50 carats, to a twisted band formation with dot and line engraving to the sides and intricate backholing. Marked 18 carat yellow gold, maker's mark for Oscar Heyman Brothers, marked 'J2314', approximate width 3.5mm, American, circa 1950, accompanied by Oscar Heyman Brothers authenticity certificate.