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Oscar Heyman Brothers diamond screw ring. A round old cut diamond is set to centre in an open back platinum claw setting with a weight of 0.60 carats, encircled by two spiraling rows of channel set tapered baguette cut diamonds in open back rubover settings, all thirty six with a combined weight of 2.00 carats. The total approximate diamond weight is 2.60 carats, to a screw step down circular ballerina cluster with intricate backholing and a structured openwork gallery, flanked by elegant sloping split shoulders tapering to a solid ridged shank. Marked 18 carat yellow gold and platinum, maker's mark for Oscar Heyman Brothers '24105', American, circa 1960, accompanied by Oscar Heyman Brothers authenticity certificate.