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Green tourmaline and diamond coronet cluster ring. Set with one central square old cut natural unenhanced tourmaline in an open back claw setting with an approximate weight of 1.20 carats, encircled by a single row of eight round brilliant cut diamonds in open back claw and rubover settings with an approximate total weight of 1.20 carats, to a coronet cluster design featuring polished borders, an intricately pierced gallery and open backholing, leading to raised shoulders and flowing through to a solid shank. Tested yellow gold and platinum, Russian, circa 1960.