A listing of notes on tourmaline semi-precious gemstones Tourmaline Notes Tourmaline, occurs in more colors and combinations of colors than any other gemstone variety. Many stones in the Russian Crown jewels from the 17th Century once thought to be rubies are actually tourmalines. Tourmaline is also of interest to scientists because it changes its electrical charge when heated. It becomes a polarized crystalline magnet and can attract light objects. This property was noticed long ago before science could explain it.
Tourmaline occurs in every color of the rainbow and in combinations of two or three colors.
Bicolor and tricolor tourmalines, with bands of colors are very popular. Sometimes the colors are at different ends of the crystal and sometimes there is one color in the heart of the crystal and another around the outside. Sometimes designers set slices of the crystal instead of faceted stones to show off this phenomenon. Almost every color of tourmaline can be found in Brazil, especially in Minas Gerais and Bahia. Pink and green colors are particularly popular.