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Oscar Heyman Brothers marquisediamond ring. Centrally set with a marquise shape brilliant cut diamond, H-I colour, VS1-VS2 clarity, with an approximate weight of 1.00 carats in an open backclaw setting, flanked by eighteen marquise shape brilliant cut diamonds, H-I colour, VS1-SI2 clarity, with a combined weight of 5.00 carats in an open back claw settings. The total approximate diamond weight is 6.00 carats, to an impressive graduating design featuring diamonds set around the full circumference, open linear gallery and fancy shaped open backholing. Testedplatinum, numbered '509506', American, circa 1970, accompanied by Gemmological Certification Services report #5777-9518 and certificate of authenticity from Oscar Heyman Brothers.