The only place you can find tanzanite is near Mount Kilimanjaro, Northern Tanzania. It was first discovered by Manuel D'Souza in 1967, though he incorrectly labeled it as sapphire because of its blue color. Eventually, it got out to the world that there was a new rare gem that could only be found in Tanzania. This rare gem was called zoisite, as it was made out of a variety of the mineral zoisite. Tons of people started putting claims into mining near Mount Kilimanjaro. They knew there was only a short supply of zoisite, and they wanted to get in on it quickly.
Tiffany and Co. got word of this new gem and decided they wanted to become the world's largest distributor of it. In 1968, they promoted their new collection of this stone. They renamed it tanzanite in honor of Tanzania. Henry Platt, president of Tiffany and Co, called it "the most beautiful blue gemstone to be discovered in 2,000 years." Everybody thought he was right, and thus the craze of tanzanite began.