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Antique tourmaline and diamond cluster ring. Set to centre with an oval old cut natural unenhanced tourmaline in an open back claw setting with an approximate weight of 3.50 carats, flanked by six round old cut diamonds in open back claw settings with an approximate combined weight of 1.00 carats, to an elegant tapered cluster form with intricate pierced claws and carved scrolling shoulders, leading to a solid tapered D-shape shank. Marked 18 carat yellow gold, circa 1900.