Black obsidian is a great grounding stone, and its energy may work by helping you in moving any excess energy down thru the earth's star chakra through Mother Gaia for grounding. Another facet of black obsidian is its ability to draw in negative energy, thus protecting the wearer or the surroundings in which it is placed. As such, black obsidian is used as protection in various body adornments and in many areas of the home.