Lot 248. An impressive 45.65 carats Colombian emerald and diamond necklace. Estimate CHF800,000 – CHF1,000,000 ($839,398 - $1,049,248).Price realised CHF 905,000. © Christie's Image Ltd 2015

Suspending an octagonal-cut emerald, weighing approximately 45.65 carats, to the flexible brilliant and baguette-cut diamond triple line chain, interspersed with baguette-cut diamond links, 42.0 cm 

Accompanied by report no. 79282 dated 23 March 2015 from the SSEF Swiss Gemmological Institute stating that the emerald is of Colombian origin, with indications of minor amount of oil, and an Appendix letter stating that this " emerald is characterised by an attractive saturated green colour, combined with a fine purity rarely encountered from Colombia of this size.... The small inclusions found by microscopic examination represent the hallmarks of Colombian emeralds from the famous mining areas Muzo, Coscuez, and Chivor" 

Christie's. GENEVA MAGNIFICENT JEWELS, 13 May 2015, Geneva