A diamond, onyx and emerald 'panther' brooch, by Cartier. Photo Bonhams

The sprawling panther pavé-set with brilliant-cut diamonds, with a marquise-cut emerald eye and shaped onyx nose, wearing an onyx collar with suspended chain composed of brilliant-cut diamond and polished links, terminating in a pear-shaped emerald bead drop, mounted in 18 carat white gold, diamonds approximately 4.50 carats total, signed Cartier, numbered, maker's mark, French assay marks, European convention mark, fitted case by Cartier. Sold for £20,000 

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