An Emerald and Diamond Cluster Ring. Photo Christie's Image Ltd 2013

The rectangular cut-cornered emerald weighing approximately 13.56 carats, to an alternating circular, square and baguette-cut diamond surround, raised on trifurcated foliate shoulders to the reeded hoop. Estimate $121,760 - $152,200

Accompanied by report no.65594 dated 29 October 2012 from The Swiss Gemmological Institute (SSEF), stating the 13.558 carat emerald is natural with a moderate amount of oil in fissures, origin Colombia. 

Christie's. JEWELLERY. 5 June 2013. London, King Street