This is a piece that is a pendulum chaser. It communicates with all spirits but it destroys shadow people that keep souls bound to earth. I placed it on a chain but the stone itself is all black and creates a reflective source that due to the earth stone is seen by them. They can see themselves and they flee. This is how bad they look to other spirits. The wrap on the stone I believe is gold and you may add it to any chain or string you want to.
This is a dual magic item because it depends on how you use it, you can use to communicate with the shadow people who are not exactly people. We have one in the group so that we can help others to move on when they are stuck because of this type of darkness. We use it everywhere and it works.
See the YouTube video: http://www.youtube.com/watch?v=0XIdxjlWEKg