Black Tourmaline is a grounding stone and helps to remove negative energy but can also work on attracting positive energy. Black tourmaline promotes self-confidence and allows you to see the world more objectively. It also helps guard against electromagnetic radiation.
 
Raw Black Tourmaline is very brittle so be aware when your piece arrives it may have little pieces broken away from it.
 
Listing is for one piece, each stone is picked intuitively.