An emerald and diamond ring, by Mouawad. Photo Christie's Image Ltd 2014

Centering upon a rectangular-cut emerald, weighing approximately 10.62 carats, to the triangular, brilliant and baguette-cut diamond surround and bifurcated shoulders, mounted in gold, ring size 6. With maker's mark for Mouawad. Estimate CHF45,000 – CHF55,000 ($51,324 - $62,730)

Accompanied by report no. 71936 dated 11 December 2013 from the SSEF Swiss Gemmological Institute stating that the emerald is of Colombian origin, with indications of minor amount of oil