NATURAL RARE TANZANITE FROM ARUSHA TANZANIA AFRICA. .40 cts. dimension 5.3x4x2.6 mm. This item has inclusion. Tanzanite is the blue/purple variety of the mineral zoisite (a calcium aluminium hydroxy silicate) which was discovered in the Mererani Hills of Northern Tanzania in 1967, near the city of Arusha and Mount Kilimanjaro. Tanzanite is a very rare gem.[3][4] It is found mostly in the foothills of Mount Kilimanjaro. The mineral is named after Tanzania, the country in which it was discovered. Excepting stones found close to the surface in the early days of the discovery, Tanzanite is universally heat treated to produce a range of hues between bluish-violet to violetish-blue. Since heat treatment is universal, it has no effect on price, and finished gems are assumed to be heat-treated. Tanzanite is sometimes found in other colors, such as green, although technically it would be called 'green zoisite' rather than tanzanite. We are using a stock photo for this gemstone. (We use DHL registered Singapore post and Australia post all items are posted in Australia.) Disclaimer. We use natural sunlight when we can. We also use lights that produce as close to possible natural daylight. We use photo shop to cut and edit but not to enhance. We also know many computer screens buyers use, vary greatly along with their eye sight. You get the products we sell at a very good price because we buy in bulk. Gems and opals especially need light sometime strong to see their wide ranges of colors and color play So make sure you have a good source of light when examining them. Cheers and thanks for your support.