Lot 1646. Colombian emerald ring. Estimate 1,800,000 — 2,200,000 HKD. Lot sold 2,540,000 HKD. Photo: Sotheby's 2011.

Centring on a cushion-shaped emerald weighing 8.02 carats, flanked on each side by a cushion-shaped emerald weighing 2.91 and 2.87 carats respectively, mounted in platinum.

Ring size: 6¾

Accompanied by SSEF report numbered 58180, dated 11 January 2011, stating that the 18.00 carat emerald is natural, of Colombian origin, with no indication of clarity modification; also accompanied by an appendix stating that the emerald "exhibits an outstanding transparency and a well-saturated green colour... Natural emeralds from Colombia of this size and quality represent a great rarity and the described gemstone is thus a very exceptional treasure."

Sotheby's. Jewels and Jadeite, Hong Kong, 06 Apr 2011