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Solitaire diamond ring with marquise diamond set shoulders. Set with a round old cut diamond to centre in an open back millegrain corner claw setting with a weight of 1.00 carats, flanked by two horizontally set marquise shape old cut diamonds in open back millegrain and grain settings with a combined weight of 0.20 carats. The total approximate diamond weight is 1.20 carats, to an openwork gallery with intricate pierced backholing and flanked by elegant inward tapered shoulders, flowing down to a tapered knife edge shank. Marked platinum and iridium, maker's mark 'RS', American, circa 1925.