An emerald and diamond necklace. Photo Christie's Image Ltd 2013

The pendant designed as a diamond-set hexagonal-shaped frame centering upon a carved emerald, weighing approximately 57.24 carats, suspending a carved emerald weighing approximately 28.04 carats, to the detachable spectacle-set diamond chain, mounted in platinum and gold, emeralds late 18th-early 19th Century, remounted early 20th Century, chain 54.0 cm, pendant 9.1 cm. Estimate:  $302,084 – $517,859

Accompanied by report no. CS 50059 A & B dated 7 June 2012 from the AGL American Gemological Laboratories stating that the two emeralds are of Colombian origin, with faint traditional clarity enhancement

Christie's. MAGNIFICENT JEWELS. 15 May 2013. Geneva. www.christies.com