Tanzanite is relatively new to the colored stone galaxy. This transparent blue gem first turned up in 1962, scattered on the Earth’s surface in northern Tanzania, in Eastern Africa.
Tanzanites are routinely heat-treated to produce colors that include light to dark violetish blue and bluish purple, as well as pure blue.
It is a special-care gem for two reasons: its sensitivity to thermal shock and its potential for cleavage. Pendant and earrings are then safer choices for jewellery settings.