17.64 carats Cat's-Eye Chrysoberyl and Diamond Ring. Estimate HK$500,000 - 800,000 (US$64,000 - 103,000). Photo Tiancheng International

Centring on a double cabochon cat's-eye chrysoberyl weighing 17.64 carats, embellished with brilliant-cut diamonds extending to the shoulders, mounted in 18 karat yellow gold. Ring size: 5¾

Accompanied by GRS report numbered GRS2014-112278, dated 11 November 2014, stating that the 17.64 carat cat's-eye chrysoberyl is natural, Greenish-Yellow (GRS-type "honey" ) colour, with no indication of treatments.

Tiancheng International. HONG KONG AUTUMN AUCTION, Jewellery and Jadeite