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Oscar Heyman Brothers ruby and diamond cocktail ring. Set with a graduated row of nine channel set natural unenhanced rectangular baguette cut rubies in open back rubover settings with an approximate combined weight of 1.19 carats, and forty six round brilliant cut diamonds in open back grain settings with an approximate combined weight of 1.25 carats to two bombe cluster rows and further set to four rows on the shoulders, with an openwork gallery detailed with Oscar Heyman Brothers dot and line markings and intricate pierced backholing, flanked by tapered stepped shoulders to a solid ridged shank. Marked 18 carat yellow gold, maker's mark for Oscar Heyman Brothers, numbered '34996', American, circa 1970s.