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Art Deco square diamond cluster ring. Set with a round old cut diamond to centre in an open back grain set millegrain box collet with an approximate weight of 0.30 carats, surrounded by a double row of round old single cut diamonds in open back grain settings, thirty two in total with a combined weight of 0.64 carats. The total approximate diamond weight is 0.94 carats, to an elegant square cluster with rounded corners and an openwork conforming gallery and fancy shape open backholing flanked by openwork trumpeting shoulders tapering down to a solid flat shank. Marked platinum, circa 1930.