In reality, it is a well recognized fact that tourmaline's diversity in color is not limited to the seven colors of the rainbow.
Tourmaline can be colorless to just about any color, hue, or tone known to man.
And if range of colors among different tourmalines is not enough, individual crystals can vary in color along their length or in cross-section. The variations in color along a crystal's length give rise to the bicolor and tricolor tourmalines which have multitudes of color combinations. Learn more about tourmaline from books . Jewelry Central . All rights reserved.