What is a watermelon stone?

What is the most expensive tourmaline?

Paraiba Tourmaline

How many colors of tourmaline are there?

They can be green, blue, or yellow, pink to red, colorless or color-zoned. Even slight changes in the composition can cause completely different colors. – Pink tourmaline is colored by the trace element manganese.

Where is tourmaline most commonly found?

Localities. Gem and specimen tourmaline is mined chiefly in Brazil and many parts of Africa, including Tanzania, Nigeria, Kenya, Madagascar, Mozambique, Malawi, and Namibia.

What stone is harder than a diamond?

Moissanite, a naturally occurring silicon-carbide, is almost as hard as diamond. It is a rare mineral, discovered by the French chemist Henri Moissan in 1893 while examining rock samples from a meteor crater located in Canyon Diablo, Arizona. Hexagonal boron-nitride is 18% harder than diamond.


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