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Antique opal and diamond cluster ring. Set to centre with an oval cabochon natural white opal in an open back claw setting with an approximate weight of 2.50 carats, encircled by twenty two round old cut diamonds with an approximate weight of 1.50 carats in open back claw settings to an elegant marquise shape cluster form, flanked by split tri-part shoulders to a solid D-shape shank. Marked 18 carat yellow gold, circa 1900.