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Art Deco diamond cluster ring. Set with a cushion shape old mine diamond to centre in an open back rubover setting with a weight of 1.40 carats, surrounded by fourteen round old cut diamonds in open back grain settings and rubover borders with a combined weight of 1.00 carats. The total approximate diamond weight is 2.40 carats, to a circular openwork cluster form with intricate backholing, supported by heavy tapering shoulders to a solid flat shank. Tested platinum, French import mark, circa 1935.