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Sapphire and diamond cluster ring. Set centrally with a cushion shaped old cut natural unenhanced Ceylon sapphire in an open back rubover setting with an approximate weight of 2.25 carats, and further enhanced by fourteen round old cut diamonds in open back grain settings with an approximate combined weight of 0.50 carats, all to an elegant bombé form with geometric openwork and millegrain decoration, the finely pierced scrolling gallery and fancy backholing leading to carved openwork shoulders and terminating in a solid D-shape shank. Tested platinum, circa 1920.