Black Tourmaline crystal is a powerful stone for protection against negative energy of all kinds including mental protection and EMF protection. 

They are wonderful healing crystals for you to use as they bring relief from pain, boost the immune system, aid stress and arthritis.

Place black tourmaline near your bed or in the corner of a room, for amplified protection for you and your space. Carry it with you in your pocket for extra protection while in public or at work.