Tanzanite has a hardness of 6.5 to 7.0 on the Mohs’ scale; therefore it is more susceptible to wear and tear than a diamond or sapphire. You should take care to protect it from scratches, sharp blows and extreme temperatures. Ultrasonic cleaning of tanzanite is not recommended.
The best way to clean Tanzanite is to use Connoisseurs Delicate Jewelry Cleaner. First, put the stopper in the sink. Immerse the jewelry in the jar of cleaner for a few minutes. Use the strainer to remove the jewelry and brush it gently. Use the specialized brush to get between prongs and under the setting to remove any buildup that prevents the stone from looking its best. Then rinse the jewelry under warm water and dry with a lint free cloth.
Learn more about tanzanite in this article, “December Birthstone Tanzanite Tops Holiday Wish Lists.”