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Diamond tourbillon ring. Set with one cushion shape old mine diamond in an open back claw setting with a weight of 1.01 carats, the swirling shoulders set with twenty two round eight cut diamonds in open back grain settings with a combined weight of 0.22 carats. The total approximate diamond weight is 1.23 carats, to a tourbillon design ring, the central collet with raised claws, the tapering swirling shoulders with millegrain edging, fancy shaped backholing and flowing through to etched linear detailing and a slim flat shank. Tested platinum, circa 1910.