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Sapphire and diamond coronet cluster ring. Set centrally with an oval old cut natural unenhanced sapphire in an open back rubover setting with an approximate weight of 1.00 carats, encircled by twelve round old cut diamonds in open back grain settings with a combined approximate weight of 1.10 carats, to a vertical coronet cluster design with millegrain details throughout, a finely engraved gallery and fancy backholing, the elaborate trumpeting shoulders with openwork and engraved adornment lead through to a slim D-shape shank. Marked platinum, English, circa 1920.