Caring for Tourmalines
It has a hardness of 7-7.5 on the Mohs Scale (similar to Emerald), Gems with a hardness of 6-7 or greater are quite suitable for rings which are worn occasionally. For a ring like a wedding or engagement ring, intended for everyday wear over a period of years, a hardness rating of 8-10 is recommended. Warm, soapy water is the best method for cleaning tourmaline. The use of ultrasonic and steam cleaners is not recommended.