Exquisite fancy vivid blue diamond, rock crystal and diamond ring. Photo Sotheby's

Centring on a cushion-shaped fancy vivid blue diamond weighing 2.05 carats, embedded in a carved oval rock crystal, bordered by brilliant-cut diamonds extending to the shank, mounted in 18 karat white gold. Estimate 10,000,000 — 12,000,000 HKD - Lot sold. 11,860,000 HKD

Ring size: 5½

Accompanied by GIA report numbered 2125990712, dated 10 February 2011, stating that the 2.05 carat diamond is natural, Fancy Vivid Blue colour, VS1 clarity

Sotheby's. Magnificent Jewels and Jadeite. Hong Kong | 05 Oct 2011 -www.sothebys.com