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Circular diamond cluster ring. Set with one central round old cut diamond in an open back grain setting with a weight of 0.40 carats, encircled by thirty round old cut diamonds in open back grain settings with a total weight of 1.60 carats. The combined approximate diamond weight is 2.00 carats, to a bombé shaped cluster with millegrain detailing and smoothly integrated shoulders which lead on to a square ridged shank. Marked platinum, French, circa 1930.