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Oscar Heyman Brothers sapphire and diamond ballerina coronet cluster ring. Set to centre with an oval old cut natural unenhanced sapphire in an open back yellow gold claw setting with an approximate weight of 2.06 carats, encircled by a channel set row of tapered baguette cut diamonds in open back platinum claw settings with an approximate combined weight of 1.58 carats, to an elegant oval ballerina cluster with a structured wirework gallery and intricate pierced backholing, flanked by ridged split shoulders, flowing down to a solid tapered lightly rounded shank. Marked 18 carat yellow gold and platinum, maker's mark for Oscar Heyman Brothers, numbered '33036', American, circa 1970.