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Oscar Heyman Brothers sapphire and diamond ring. Set with three tapered rows of channel set natural unenhanced rectangular baguette cut sapphires in open back rubover settings, fifteen in total with an approximate combined weight of 3.20 carats, and four vertical graduated rows of round brilliant cut diamonds, twenty four in total with an approximate combined weight of 0.80 carats in open back grain settings, all to a bombe domed cluster, conforming to the finger with Oscar Heyman Brothers dot and line detail, intricate rectangular pierced backholing and flanked by heavy stepped tapered shoulders, to a solid ridged shank. Marked 18 carat yellow gold, maker's mark for Oscar Heyman Brothers, numbered '27591', American, circa 1970s.