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Sapphire and diamond cluster ring. Set with a cushion shape old cut natural unenhanced Ceylon sapphire in an open back rubover setting with an approximate weight of 3.00 carats, further set with sixteen round old cut diamonds in open back grain settings with a combined approximate weight of 3.00 carats, to a tapered conforming cluster with ornate backholing, the shoulders leading through to a solid D-shape shank. Marked platinum, maker's mark, French, circa 1930.