A natural pearl and diamond brooch/pendant, third quarter of the 19th century. Photo Bonhams.

The natural pearl, measuring 11.3 x 11.8 x 10.5mm, within a cushion-shaped diamond surround, with old brilliant-cut diamond highlights, suspending a detachable pendant centrally-set with a pear-shaped diamond weighing 1.47 carats, within a cushion-shaped and old brilliant-cut diamond surround, mounted in silver and gold, diamonds approximately 10.20 carats total, later pin fitting, length 5.0cm. Estimate £20,000 - 30,000 (€24,000 - 36,000)

Bonhams.FINE JEWELLERY, London, New Bond Street, 30 Apr 2014 - www.bonhams.com