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Oscar Heyman Brothers diamond and rubycluster ring. Set to centre with a single round old cut diamond, E colour, SI1 clarity, with an approximate weight of 2.52 carats, in an open backclaw setting, bordered by an undulating row of twenty four tapered baguette cut natural unenhanced rubies in open back ruboverchannel settings with a combined approximate weight of 3.00 carats, to a rippling cluster design featuring a finely pierced gallery, signature Oscar Heyman Brothers dot and dash engraving and decorative pierced open backholing leading to smoothly conforming trumpeting shoulders with ridged detail flowing through to a grooved shank. Testedplatinum, maker's mark for Oscar Heyman Brothers, numbered '508892', American, circa 1970, accompanied by Gemological Institute of America report #2171478681.
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