An emerald and diamond three-stone ring. Photo: Bonhams.

The rectangular step-cut emerald, weighing 2.54 carats, between step-cut diamond shoulders, diamonds approximately 2.20 carats total, ring size Q (sizing band). Estimate £12,000 - 15,000 (€15,000 - 18,000)

Accompanied by a report from AnchorCert stating that the 2.54 carat emerald is of Colombian origin, with evidence of minor clarity enhancement. Report number 20015212, dated 19 March 2014.

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