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A 19th century topaz and pearl brooch. Photo: Bonhams.

The foiled modified cushion-shaped orange topaz, within a half-pearl border, in closed-back settings, half-pearls untested, length 2.7cm. Estimate £3,000 - 4,000 (€3,600 - 4,900)

Bonhams. JEWELLERY. London, Knightsbridge, 9 Apr 2014 - www.bonhams.com