An exceptional Emerald and diamond ring. Photo Christie's Image Ltd 2012

Set with an hexagonal-cut emerald, weighing approximately 18.86 carats, to the baguette-cut diamond shoulders, mounted in platinum, ring size 6¼. Estimate CHF860,000 - CHF1,200,00

Accompanied by report no.12075175 dated 26 July 2012 from the Gübelin GemLab stating that the emerald is of Colombian origin, with no indications of clarity enhancement and a Note

Report no. 63867 dated 25 June 2012 from the SSEF Swiss Gemmological Institute stating that the emerald is of Colombian origin, with no indications of clarity modification, and an Appendix stating that 'The shape actually has been chosen carefully and perfectly reflects the six-sided outline of the original emerald crystal from which it has been cut. (...) Its saturated green colour is due to a combination of well-balanced trace elements in the gemstone, typical and characteristic for the finest emeralds of Colombia.' 

Christie's. Geneva Magnificent Jewels 13 November 2012 Geneva