1. tourmaline:

It's a borosilicate crystal, which is a kind of tourmaline reaching the jewelry level.

2. Ruby and sapphire:

It belongs to a high-grade gem variety and is the hardest substance except diamonds on the earth.

Second, the hardness is different:

1. tourmaline:

The Mohs hardness of tourmaline is 7-8.

2. Ruby and sapphire:

Ruby and sapphire have a Mohs hardness of 9.

Extended data

The mineralogical name of tourmaline is tourmaline, and the English name is tourmaline, which comes from the word "Turmali" in ancient Sinhalese language, meaning "mixed gem".

In some historical documents of our country, it is called arsenic, tourmaline, bixia stone, broken evil gold and so on. Tourmaline crystal Tourmaline is a complex triangular columnar crystal, and there will be characteristic growth stripes on the surface of the crystal parallel to the extension direction of the columnar crystal. In cross section, it is a curved spherical triangle.

Legend has it that tourmaline is a favorite of Empress Dowager Cixi. There are many tourmaline jewelry in the funeral of Empress Dowager Cixi, among which there are many precious varieties such as watermelon tourmaline. There are many kinds of tourmaline ornaments, such as tourmaline bracelets, tourmaline rings, tourmaline pendants and so on.

Baidu encyclopedia-tourmaline

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