Tanzanite stone is a blue-violet variety of the mineral zoisite, which is found only in Tanzania. It is prized for its unique color and is often used in jewelry. It is a relatively new gemstone, having been discovered in 1967.

It is considered a fairly rare gemstone and is typically only found in small sizes, making it more expensive than many other gemstones. It is also known for its ability to change color when viewed from different angles, shifting from a deep violet to a bright blue.