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Oscar Heyman Brothers diamond cluster ring. Set with a round old cut diamond to centre in an open back claw setting with a weight of 0.52 carats, encircled by a single row of eight round old cut diamonds in open back claw settings with a combined weight of 0.53 carats. The total approximate diamond weight is 1.05 carats, to an elegant openwork cluster with an intricate wirework gallery, pierced backholing and split tri-part shoulders, flowing down to a solid ridged shank. Marked platinum and iridium, maker's mark for Oscar Heyman Brothers, numbered '66696', American, circa 1960s.