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Oscar Heyman Brothers diamond screw ring. Set to centre with a single round old cut diamond in an open backclaw setting with an approximate weight of 0.60 carats, encircled by two spiraling rows of thirty six tapered baguette cut diamonds in open back rubover settings, with a combined weight of 2.15 carats. The total approximate diamond weight is 2.75 carats, to a circular ballerinacluster featuring polished borders, a structured openwork gallery and intricately pierced open backholing, leading to split shoulders and flowing through 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.