Tanzanite is a rare gem. It is found mostly in the foothills of Mount Kilimanjaro (Tanzania). It has a deep purplish blue colour which is unique to tanzanite only. The Gemmological Institute of America classifies tanzanite as a Type I gemstone, meaning it is normally eye-flawless. Gems with eye-visible inclusions will be traded at deep discounts. Tanzanite in its rough state is usually a reddish brown color. It requires artificial heat treatment to 600 °C in a gemmological oven to bring out the blue-violet of the stone. Since heat treatment is universal, it has no effect on price, and finished gems are assumed to be heat treated. A 6.5 on the Moh’s scale of Hardness, Tanzanite is not recommended for everyday wear unless well protected in its setting.