Sapphire and diamond ring. Photo Sotheby's

Centring on an oval sapphire weighing 25.69 carats, surrounded by oval diamonds together weighing approximately 5.50 carats, mounted in platinum, signed A. Reza. Ring size: 6½. Estimate 3,500,000 — 4,000,000 HKD - Lot Sold. 4,240,000 HKD

Accompanied by Gübelin report numbered 11055182, dated 31 May 2011, stating that the sapphire is natural, of Burmese origin, with no indications of heating.

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