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Sapphire and diamond coronet cluster ring. Set centrally with a oval old cut natural unenhanced sapphire in an open back rubover setting with an approximate weight of 0.70 carats, bordered by seventeen round old cut diamonds in open back grain settings with a combined approximate weight of 0.50 carats, to an oval openwork coronet cluster design with an intricate pierced gallery, open backholing and elaborate trumpeting shoulders which lead through to a D-shape shank. Tested platinum, English, circa 1920.