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Old mine diamond studs. A matching pair of earrings, each set with a cushion shape old mine diamond in an open back rubover setting, the two in total with a combined approximate diamond weight of 2.40 carats, to an octagonal shaped openwork collet with decorative engraved detail, open backholing and fitted to reverse with a secure post and butterfly. Earrings tested platinum, butterflies marked platinum, English, circa 1920.