How hard is tanzanite?
Please see our in-depth discussion on tanzanite hardness here. Tanzanite has a Mohs hardness of 6.5 to 7.0 and is considered durable enough to be worn in practically any type of jewelry. As with any jewelry that is worn, it should be cared for. Tanzanite will scratch more easily than sapphire or diamond and should not be exposed to harsh chemicals and ultra-sonic cleaning.