The pendulum is a divinatory tool that is used to communicate with spirit via your higher self or your guides. Pendulums can be used to answer "yes or no" questions as well as find lost objects.
Carnelianencourages motivation, endurance, and courage. Brings good luck and protection from negative energy.
Quartz is an over all healer, an amplifier.
Black Obsidian is a stone of protection, an EMF buffer.