Tanzanite was discovered in the 1960s and is named after the country and its only source of production, Tanzania. Purple tanzanite is mostly heat treated to reduce the tone and increase the more popular blue hue. Tanzanite is a soft stone which should be protected from the sun when worn outdoors, its sensitivity to light can cause discolouration.
Moh hardness: 6.5 (1 softest to 10 hardest)
Tanzanite is a reasonably durable gemstone but can be susceptible to scratching, damage from hard knocks. Tanzanite jewellery should be stored in a soft jewellery pouch or box when not being worn to avoid scratching and damage. It should be cleaned thoroughly with water and dried with a soft jewellery cloth. Tanzanite jewellery should not be cleaned with diamond or gemstone solution cleaner and contact with harsh detergents and chemicals such as bleach or chlorine should be avoided as they may cause erosion to the stone.