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Old mine diamond engagement ring. Set to centre with a cushion shape old mine diamond in an open back claw setting with a weight of 1.02 carats, flanked by two rectangular baguette cut diamonds in open back rubover settings with a combined weight of 0.10 carats. The total approximate diamond weight is 1.12 carats, to an elegant solitaire design with pierced openwork collet, curved claws and geometric backholing, the raised linear shoulders proceeding to a solid D-shape shank. Tested yellow gold and platinum, circa 1920.