Lot 1210. Rare Color-change Natural Spinel, Burma. Weighing approximately 10.01 carats and measuring 13.17 x 10.5 x 8.70mm. Sold for US$ 11,875 (€10,605). Photo: Bonhams.

This rare color change spinel displays both excellent clarity and luster. A natural spinel, it changes from violetish blue in daylight to violet in incandescent light.

Accompanied by an American Gem Trade Association (AGTA) report no. 99013309 dated September 14, 2006 stating that the 10.01 carats natural spinel changes from violetish blue in daylight to violet in incandescent light.

Bonhams. AUCTION 23397: LAPIDARY WORKS OF ART, GEMSTONES, MINERALS AND NATURAL HISTORY - LOS ANGELES