A pair of opal and diamond pendent earrings, circa 1890-1900. Photo: Bonhams.

Each oval cabochon opal highlighted by collet-set rose-cut diamonds, suspending a cushion-shaped diamond in square collet-setting and a pear-shaped cabochon opal drop, within a border set with spaced collet-set cushion-shaped diamonds, cushion-shaped diamonds approx. 1.00ct total, later earring fittings, length 5.6cm, cased by Yves Roué & Fils, Paris. Estimate £1,800 - 2,500 (€2,200 - 3,000)

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