An emerald and diamond dress ring, by Bulgari. Photo Christie's Image Ltd 2012

The octagonal-cut emerald centre weighing approximately 10.11 carats, to the bombé design bezel, pavé-set with circular-cut diamonds and baguette-cut diamond shoulder accents, to the plain hoop. Signed Bulgari. Estimate £65,000 - £75,000. Price Realized £253,250 ($407,479)

Accompanied by report no.65598 dated 29 October 2012 from The Swiss Gemmological Institute (SSEF), stating the emerald has no indications of clarity modification, origin Colombia 

Christie's. Important Jewels. 12 December 2012. London, King Street