Tanzanite calms "high frequency" types who tend to live in a very intense state, helping to slow them down and mellow them out. Keeps you organized, productive, and able to get a lot accomplished without being insensitive to others or being too bossy or demanding. It is balancing to those in a position of service and keeps them from over-extending themselves, or falling into negative habit patterns, such as being overly bossy.
Tanzanite also has many of the same abilities as that of the blue Sapphire, in that it dispels stress, improves communications and is a mood elevator. It can also overcome long-term misfortunes and has been known to help protect from travel dangers.