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Solitaire cushion shape diamond ring. Set to centre with a cushion shape old mine diamond in an open back claw setting with an approximate weight of 0.60 carats, to a solitaire design featuring curving integrated claws, polished edges and open backholing, the bi-colour split shoulders with grooved detail tapering to a solid ridged D-shape shank. Tested yellow gold and platinum, circa 1910.