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Tanzanite is a blue variety of the gemstone zoisite. It consists of calcium aluminium silicate and is not particularly hard, having a value of 6.5 to 7 on the Mohs scale. For that reason, it should always be worn carefully and never placed in an ultrasonic bath for cleaning or brought into contact with acids.
This are, 2 pieces of 3.50 mm round cut tanzanite, total weight 0.35 ct., deep blue - purple colour, genuine tanzanite and good lustre. Selected stones. Thanks for viewing.