Tourmaline:Tourmaline is a semi-precious gemstone that comes in a wide variety of colors. It is found in many different parts of the world, but most notably in Brazil, Africa, and the United States. Tourmaline is known for its unique coloration, which can range from deep green to pink to blue. It is also one of the few gemstones that can be found in all three primary colors: red, yellow, and blue.