A diamond Maltese cross brooch-pendant, circa 1820. Photo Bonhams

The arms of the cross alternating with fleur-de-lys motifs, set throughout with cushion-shaped diamonds with pear-shaped diamond highlights, with a cushion-shaped diamond cluster to the centre, mounted in silver and gold, detachable pendant loop, diamonds approximately 11.50 carats total, width 5.2cm, fitted case by Collingwood & Son, 48 Conduit St London. Sold for £15,000

Note: By tradition the stones in this pendant were formerly the property of Richard Bourchier, Governor of Bombay 1750-1760.

Bonhams. Fine Jewellery, 25 Apr 2012. London, New Bond Street www.bonhams.com