20.46 carats Alexandrite Cat's-Eye Chrysoberyl and Diamond Ring. Estimate 1,300,000 — 1,600,000 HKD (146,455 -180,253 EUR). Photo Sotheby's

Centring on an alexandrite cat's-eye chrysoberyl weighing 20.46 carats, to a mount of bombé design, pavé-set with diamonds and diamonds of brownish hue together weighing approximately 5.00 carats, mounted in 18 karat white and yellow gold. Ring size: 9

Accompanied by GRS report numbered GRS2014-0411961, dated 29 April 2014, stating that the 20.46 carat cat's-eye alexandrite is natural, colour changing from yellowish-green (daylight) to brownish-red (incandescent light), with no indication of treatments. Also accompanied by SSEF report numbered 78678, dated 26 February 2015 respectively, stating that the 20.46 carat cat's-eye alexandrite is natural, of Sri Lankan (Ceylon) origin, with no indications of treatment.

Sotheby's. Magnificent Jewels & Jadeite, Hong Kong, 06 avr. 2015, 01:00 PM