6.08 carats Brazilian Alexandrite and Diamond Ring. Estimate 320,000 — 520,000 HKD (37,758 - 61,357 EUR). Photo Sotheby's

Centring on an oval alexandrite weighing 6.08 carats, embellished by rose-cut diamonds together weighing approximately 1.10 carats, mounted in 18 karat white gold. Ring size: 5¾

Accompanied by GRS report numbered GRS2007-071622, dated 13 July 2007, stating that the 6.08 carat alexandrite is natural, of Brazilian origin, with a pronounced colour-change from greenish-blue (daylight) to purplish-red (incandescent light), with no indication of treatments.

Sotheby's. Fine Jewels & Jadeite, Hong Kong, 02 déc. 2015, 01:30 PM