Emerald and diamond ring. Photo Sotheby's

Centring on a step-cut emerald weighing 8.79 carats, to a stylised mount set with step- and circular-cut diamonds together weighing approximately 1.20 carats, mounted in platinum and 18 karat yellow gold. Ring size: 5½. Estimate 2,100,000 — 2,600,000 HKD. Lot Sold. 2,440,000 HKD

Accompanied by AGL report numbered CS 55390, dated 9 July 2013, stating that the 8.79 carat emerald is natural, of Colombian origin, with no clarity enhancement; further accompanied by a letter stating that this emerald "exhibits a high clarity, providing a superior degree of transparency....The vivid and lush colour, as well as high clarity present in this beautiful gem is representative of top-quality material recovered from the Chivor mining area."

Sotheby's. Magnificent Jewels and Jadeite, Hong Kong | 07 Apr 2014 - www.sothebys.com