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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 lot, 2 pieces of 1.90 mm round faceted cut tanzanite, weight 0.07 ct., blue - violet colour, good lustre , nice small stones.Thanks for viewing.