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Art Deco diamond cluster ring. Set to centre with a single cushion shape old mine diamond in an open back rubover setting with an approximate weight of 1.40 carats, bordered by fourteen round old cut diamonds in open back grain settings with a combined weight of 1.00 carats. The total approximate diamond weight is 2.40 carats, to an elegant cluster design, featuring openwork decoration, a solid gallery and intricate open backholing, leading to smooth trumpeting shoulders and tapering down to a solid flat shank. Tested platinum, French import mark, circa 1935.