An emerald and diamond ring. photo courtesy Bonhams

The claw-set step-cut emerald, flanked by shield-shaped diamond shoulders, emerald approximately 8.10 carats, diamonds approximately 1.00 carat each, ring size M - Estimate: £30,000 - 40,000

Accompanied by a CISGEM certificate stating that the characteristics suggest the emerald is of Columbian origin with evidence of minor clarity enhancement. Certificate number 47365, dated 8th September 2008.

Bonhams. Fine Jewellery, 22 Sep 2010  New Bond Street www.bonhams.com