Tanzanite Collection

Tanzanite is a variety of the mineral zoisite. The blue and violet colors of tanzanite are caused by the presence of vanadium. Tanzanite is also known for its strong pleochroism, which means that it can appear to change color depending on the viewing angle. In some stones, the pleochroism can be so strong that the stone can appear to be two different colors, such as blue and violet.