Emerald and diamond cluster ring. Set with a rectangular emerald-cut emerald to centre in an open back rubover millegrain setting with an approximate weight of 0.40 carats, flanked by two round old cut diamonds in open back grain settings with a combined weight of 0.20 carats, further set with eighteen round old single cut diamonds in open back grain and rubover millegrain settings with a combined weight of 0.40 carats. The total approximate diamond weight is 0.60 carats, to a curving stepped cluster with elegant openwork to the scrolling shoulders and an intricate pierced gallery with backholing, tapering to a shaped solid D-shape shank. Marked platinum and iridium, engraved with 'M.B.D. 12.25.50', American, circa 1950.