Pendulums are used to find the answers of yes and no questions. You ask your higher self so that you get the truth and not what your heart wants. Hold the pendulum in the opposite hand to the one you write with. Ask your higher self to show you a YES, stop. Show me a NO, stop.
Pendulums can vary in shape from photo, but are all true crystal.
Bluestone works on your throat chakra. It is man made and worn for its beauty.