Brazilian  alexandrite and Diamond Necklace. Estimate 940,000 — 1,400,000 HKD (110,914 - 165,191 EUR). Photo Sotheby's.

Set with twenty-seven cushion-shaped alexandrites, spaced by pear-shaped diamonds, to the diamond-set floral clasp, the alexandrites and diamonds together weighing approximately 32.10 and 10.60 carats respectively, mounted in platinum, length approximately 425mm. 

Accompanied by Gübelin report numbered 12011005, dated 7 January 2012, stating that the alexandrites are natural, of Brazilian origin, with pronounced colour-change from bluish green (daylight) to purple (incandescent light).

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