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Oscar Heyman Brothers emerald and diamond three row dress ring. Set with fifteen round brilliant cut diamonds to three graduated rows in open back grain settings with an approximate combined weight of 0.48 carats, and twelve square calibre channel set natural emeralds with no colour enhancement to three graduated rows in open back rubover settings with an approximate combined weight of 0.78 carats, to a heavy stepped form with intricate pierced square backholing, tapering at the shoulders to a solid stepped shank. Marked 18 carat yellow gold, maker's mark for Oscar Heyman Brothers, numbered '35332', American, circa 1960s.