Notice the Chatoyancy on these! It's rare to find Black Tourmaline with such flashiness!

Black Tourmaline is the classic stone of protection, said to absorb negative energy from around the wearer. I personally don't see the absorption, but awakened Tourmaline does form a sort of null field around you that repels unbeneficial energy. This stone resonates to the Root Chakra, with a strong, steady energy that boosts vitality and grounds excess energy.