Lot 185. A fine 8.20 carats octagonal step-cut Colombian emerald ring. Estimate CHF400,000 – CHF500,000 ($411,364 - $514,205). Photo Christie's Image Ltd 2016

Set with an octagonal step-cut emerald, weighing approximately 8.20 carats, to the plain hoop, ring size 7 ½, mounted in gold

Accompanied by report no. 16025004 dated 9 February 2016 from the Gübelin GemLab stating that the origin of the emerald is Colombia, with no indications of clarity enhancement, and an Information Sheet on 'Untreated emeralds'.

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