Tanzanite comes in a wide range of colors: blues, purples, cyan and even pinks can be shown in this stone. It is quite brittle - with a hardness of 6.5-7.0 on the Moss scale, tanzanite easily splits and scratches.
Also, tanzanite often has pleochroism - a change in the color of the stone depending on the angle of view. Moreover, unlike iolite, which has dichroism (the stone changes color from cornflower blue to grey/colorless), tanzanite has trichroism - its color varies between purple-blue-brown/yellow.
Tanzanite became widely popular thanks to the jewelry company Tiffany, which proposed the name in honor of Tanzania, where there is the only mine in the world.
The most famous tanzanite was filmed in James Cameron's "Titanic" - the same stone in the "Heart of the Ocean" pendant.
Jewelry with tanzanite should be worn carefully, protected from shock and other strong mechanical influences.