Crystal Listing is for ONE PIECE raw black tourmaline rod (RK16-B23B) Rods with Rough finish STOCK PHOTO. Each piece can vary slightly in size and shape Chakra: Earth, protects all Tourmaline comes from the Singhalese term "turamali", which translates as the stone of mixed colors. Tourmaline is often referred to as the rainbow gemstone. In Legend, Egyptians believed that tourmaline traveled from the earths' core to the surface along a rainbow which gave it all the various shades. Something that we find interesting about Tourmaline, is that it is piezoelectric, which means it generates electricity under pressure, and pyroelectric, generating electricity with heat.