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The Heat Treatment of Tanzanite

Virtually all tanzanites are heat-treated to produce the beautiful blue-purple colours. There is a very small amount of unheated material but the stones tend to have secondary colouration (green). Tanzanite is very strongly trichroic and will display three colours depending on the orientation of the crystal. The correct orientation is imperative in the cutting process to achieve the best colours.

The Origin of our Tanzanite

All tanzanite is mined at the deposits in the Manyara Region of Northern Tanzania.