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Diamond cluster ring. Set with one central round old cut diamond in an open back grain setting with an approximate weight of 0.40 carats, encircled by thirty round old cut diamonds in open back grain settings with a combined weight of 1.60 carats. The total approximate diamond weight is 2.00 carats, to a bombé shaped cluster featuring millegrain detailing, a decoratively pierced gallery and open backholing, leading to engraved shoulders and flowing through to a square ridged shank. Marked platinum, French, circa 1930.