An emerald and diamond ring

A 12.86 carats cushion-cut Colombian emeraldand diamond ringEstimate $350,000 – $450,000. Photo Christie's Image Ltd 2015

et with a cushion-cut emerald, weighing approximately 12.86 carats, flanked on either side by a half moon-cut diamond, mounted in platinum

With report 14100107 dated 15 October 2014 from the Gübelin Gem Lab stating that gemmological testing revealed characteristics with those of emeralds originating from Colombia. Indications of minor clarity enhancement

With report CS 56586 dated 22 October 2014 from the American Gemological Laboratories stating that it is the opinion of the Laboratory that the origin of this emerald would be classifed as Classic Colombia. Minor clarity enhancement, Oil-type

Christie'sMAGNIFICENT JEWELS, 14 April 2015, New York, Rockefeller Plaza