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Oscar Heyman Brothers sapphire and diamond ballerina cluster ring. Set centrally with an oval brilliant cut diamond in an open back four claw setting with a weight of 0.50 carats, additionally set with a swirling row of tapered baguette cut diamonds in open back claw settings with a combined weight of 2.50 carats, interspersed with fourteen round brilliant cut natural unenhanced sapphires in open back claw settings with an approximate combined weight of 1.50 carats. The total approximate diamond weight is 3.00 carats, to a fancy swirling cluster design with an intricately pierced undulating gallery and geometric backholing, leading to raised openwork shoulders and terminating in a solid D-shape shank. Marked 18 carat gold and platinum, maker's mark for Oscar Heyman Brothers, numbered '25150', accompanied by Oscar Heyman Brothers authenticity certificate.