Tourmaline is a semi precious stone. It comes in many colors such as: Green, Blue, Black, Purple, Red, Pink, Yellow, White, Grey, Brown, Orange. The most valuable being a neon blue, green and pink. It has a hardness of 7-7.5 on the Mohs Hardness Scale.Tourmaline is the birthstone for October. It is also the 8th wedding anniversary gemstone. Tourmaline can be found all over the world and is very sought after.Your tourmaline can be valued based on color, clarity, and carat weight.