The hardness of tanzanite is 6-7, which is an embarrassing value, because as we all know, the hardness of gemstones basically represents its wear resistance, and the main component of dust particles in the air is aging, and the aging hardness is 7, which shows that gemstones with hardness not higher than this value may be worn and scratched.
Therefore, if you make a ring, be careful not to let the tanzanite be worn out. When there is dust on the surface, don't rub it hard, just rinse it with water. The color of tanzanite is blue, and the deep blue of tanzanite has fascinated countless people. Various tanzanite ornaments are also sought after by consumers. With the development of economy, many investors turn their attention to the gem market, and the price of tanzanite is getting higher and higher.
Tanzanite excavates history;
Tanzanite can only be produced in an area 4 km long and 2 km wide at the foot of Mount Kilimanjaro in Tanzania, East Africa. This is an ancient and young gem. Tanzanite was formed about 580 million years ago and has been buried below 2 kilometers underground until 1967.
And then quickly became famous in the international market. The evaluation of China gemstone industry on tanzanite is as follows: tanzanite, gem-grade zoisite, zoisite without heat treatment is reddish purple, yellow green and blue, and zoisite after heat treatment is purple blue. Hardness 6, density 3.35g/cm3, refractive index 1.690 ~ 1.705, and birefringence 0.009.