Tanzanite is one of the world’s rarest stones and is found in the area around Mount Kilimanjaro in Tanzania. These stones which were formed close to 600 million years ago have helped improve the Tanzanian economy. In fact, the gems are only found in an eight-mile area in the Merelani Hills by the city of Arusha. The unique blue color of tanzanite is caused by small amounts of vanadium within the stone’s mineral structure. Tanzanite is a member of the mineral family zoisite, and though the stone was only discovered in the 1960s, stones from its family have been used for close to two centuries. While most of the tanzanite on the planet is from northern Tanzania, small amounts of tanzanite have also been found in places as diverse as New Hampshire, Pakistan, and Italy.