Pair of Brazilian Alexandrite and Diamond Pendent Earrings. Estimate 390,000 — 550,000 HKD (46,017 - 64,896 EUR). Photo Sotheby's.

Each suspending on a cushion-shaped alexandrite weighing 3.56 and 3.42 carats respectively, embellished by circular-cut and pear-shaped diamonds altogether weighing approximately 1.60 carats, mounted in platinum. 

Accompanied by two Gübelin reports numbered 12011003 and 12011004, both dated 6 January 2012, stating that the 3.56 and 3.42 carat alexandrites are natural, of Brazilian origin, with no indications of any treatment, colour changing from bluish-green (daylight) to purple/reddish-purple (incandescent light).

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