What is Tanzanite? Tanzanite is a trade name that was first used by Tiffany and Company for gem-quality specimens of the mineral zoisite with a blue color. Tiffany could have sold the material under the mineralogical name of "blue zoisite," but they thought the name "tanzanite" would stimulate customer interest and be easier to market.
The Tanzanite Foundation Grading System. The Tanzanite Foundation has developed its own color grading system which is used mostly in its native South Africa. It has attempted to group Tanzanite colors into a simple, consumer friendly chart shown below.