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A fire opal and diamond ring, circa 1905. Photo: Bonhams.

The large step-cut fire opal, within single and rose-cut diamond-set lotus flower claws, ring size Q. Estimate £800 - 1,200 (€970 - 1,500)

Bonhams. JEWELLERY. 12 Feb 2014, London, Knightsbridge - www.bonhams.com