Lot 236. A 28.33 carats octagonal-cut Colombian emerald and diamond ring. Estimate CHF450,000 – CHF650,000 ($462,784 - $668,466). Photo Christie's Image Ltd 2016

Set with an octagonal-cut emerald, weighing approximately 28.33 carats, between trapeze-cut diamond shoulders, to the circular-cut diamond surround and shoulders, ring size 6 ½, mounted in platinum and gold

Accompanied by report no. 83160 dated 7 December 2015 from the SSEF Swiss Gemmological Institute stating that the origin of the emerald is Colombia, with no indications of clarity modification.
Report no. CS69517 dated 24 August 2015 from the AGL American Gemological Laboratories stating that the origin of the emerald is Colombia, with no clarity enhancement.

Christie's. GENEVA MAGNIFICENT JEWELS, 18 May 2016, Geneva