Alexandrite: the color changing stone
Alexandrite is a variety of gem that has the particularity of changing color depending on the light.
It is indeed blue-green in the light of day, pink-red under a desk lamp (or a wood fire) and gray colorless under a neon. Its color also changes depending on the angle at which it is observed.
Alexandrite was discovered in 1842 by Nils Gustaf Nordenskiöld. He named the gem in honor of Tsar Alexander II. This gem is very popular, and this is understandable given its history, with the Russian public.
The largest mine in Russia is now exhausted. There are sometimes Alexandrite in other countries, especially in Brazil, but they are generally of lower quality and do not necessarily change color depending on the light.
This is why the price of alexandrite often exceeds the price of diamonds.