Tourmaline

Tourmaline has one of the widest color ranges of any gem species. It occurs in various shades of almost every hue, and there are a number of trade names for its color varieties: rubellite (pink, red, purplish red, orangy red, or brownish red), indicolite (dark violetish blue, blue, and greenish blue), Paraiba tourmaline (intense violetish blue, greenish blue, or blue from the state of Paraiba in Brazil), chrome tourmaline (intense green), and watermelon tourmaline (pink in the center and green around the outside).
There are many sources for tourmaline: Afghanistan, Brazil (major source), Kenya, Madagascar, Mozambique, Myanmar, Namibia, Pakistan, Russia, and the US.

Tourmaline Rubellite
Tourmaline Verdelite
Tourmaline Indicolite