Tanzanite is the violet-blue variety of the mineral zoisite. The gemstone was discovered in 1967 by Manuel d'Souza in the Merelani Hills in northern Tanzania and is only found in Tanzania.
Tanzanite can be found in large crystals, often without any significant inclusions. Almost all tanzanite is heated to remove the green and/or brown tones. It is strongly pleochroic gemstone, showing purple and blue colours from different angles.
Tanzanite scratches and breaks relatively easily, so it is not particularly suitable for engagement rings or daily wear jewellery.
Tanzanite is one of the birthstones for December.
You can read more about tanzanite in our gem guide.