Demantoid garnet and diamond ring. Photo Sotheby's

Centring on an oval demantoid garnet weighing 6.47 carats, to a double-frame set with brilliant-cut diamonds together weighing approximately 2.00 carats, mounted in platinum and 18 karat yellow gold. Ring size: 5¾. Estimate 550,000 — 650,000 HKD - LOT SOLD. 687,500 HKD 

Accompanied by Gübelin report numbered 0508592, dated 25 August 2005, stating that the demantoid garnet is natural, of Russian origin.

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