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Antique turquoise and diamond ring. Set to centre with a round cabochon turquoise in an open back rubover millegrain setting with an approximate weight of carats, surrounded by eighteen round rose cut diamonds in open back cutdown settings and closed back grain settings with a combined approximate weight of carats, to a coronet cluster design with intricately shaped backholing and diamond set shoulders which smooth down to a solid D-shaped shank. Marked 18 carat yellow gold with platinum settings, maker's mark, French, circa 1900.