Fine emerald and diamond ring, Van Cleef & Arpels. Photo courtesy Sotheby's.

Centring on a cushion-shaped emerald weighing 4.75 carats, flanked by two rows of channel-set diamonds together weighing approximately 1.20 carats, mounted in platinum. Ring size: 7½. Estimate 850,000 — 950,000 HKD

Accompanied by AGL and SSEF reports numbered CS 82848 and 68811, dated 12 June and 25 June 2013 respectively, stating that the emerald is natural, of Colombian origin, with no indications of clarity enhancement.