Both alexandrite and opal alexandrite belong to the golden emeralds among the colored gems, and they are treasures among gems.
で 1830, a color-changing gem was discovered in the Ural Mountains of Russia. This day happened to be the birthday of Emperor Kaiser Alexander II of Russia, so it was named Alexandrite after the Emperor of Russia. It appears green under white light sources such as fluorescent lamps and sunlight, while it appears red when illuminated by artificial light sources or light bulbs with yellow light sources. The best discoloration is emerald green and ruby red, but it can achieve this. There are not many golden emeralds with grade discoloration. They are usually yellow-green or brown-green. There are more discolorations with purple or red-brown. The more obvious the discoloration, the higher the price of alexandrite.
There is a kind of calcium-aluminum garnet found in East Africa, which also exhibits blue-green and red-brown discoloration. しかし, this kind of calcium-aluminum garnet is a kind of garnet, so it is a single-refraction gemstone. Refraction phenomenon distinguishes these two gems. The prices of the two types of gems are quite different, so be careful when buying them.
Cat’s eye alexandrite is a golden emerald that combines the two phenomena of cat’s eye and discoloration. The output is very scarce. It is a rare gem. The main production area is Tanzania, Africa. Most gem dealers do not have stock supply, so the price is not high to what extent. Certain standards.
Alexandrite first appeared in the Ula Mountains in Russia, but it has been exhausted for a long time. 現在のところ, it is mainly produced in Sri Lanka, ブラジル, Madagascar and Tanzania. Cat’s eye golden emeralds are mainly produced in Tanzania, Myanmar and Russia.