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Vintage diamond cluster ring. Centrally set with a round old cut diamond in an open back grain setting with a weight of 0.80 carats, encircled by twenty round eight cut diamonds in open back grain settings with a combined weight of 0.25 carats. The total approximate diamond weight is 1.05 carats, to a fancy openwork cluster design with millegrain decoration throughout, linear gallery and intricately pierced backholing, flanked by split open shoulders terminating to a smooth D-shape shank. Marked platinum and iridium, maker's mark 'BMM', American, circa 1950.