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Gemstone Guide: Tanzanite

Source: Tanzania

Mineral: Zoisite

Hardness: 6-7

Colour: Blue to bluish purple (post heat treatment) and green. 

Treatments: Most Tanzanites are heat treated to transform the brown Zoisite into the blue colour with a permanent result.

Care and cleaning: Warm soapy water is the safest way of cleaning. Ultrasonic or steam should not be used.

Birthstone: December

Stone Properties: It is known for its healing and balancing energy and promote a strong sense of self control. 


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