An emerald and diamond pendant necklace. Photo: Bonhams.

The pendant set with a central cut-cornered step-cut emerald in a surround of brilliant and marquise-cut diamonds and circular-cut emeralds, with a tapered baguette-cut diamond surmount, on an articulated chain of graduated pear-shaped diamonds, diamonds approximately 40.00 carats total, principal emerald approximately 5.60 carats, pendant length 3.7cm, necklace length approximately 37.0cm. Estimate £25,000 - 30,000 (€30,000 - 36,000)

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