Pendulums can be used to pick the correct stone for your particular symptom or to answer a multitude of questions. For crystals, hold the pendulum over the stones, one at a time and ask if it is the correct stone for your issue. Note the answer and move to the next stone and ask the question again, and so on. First, be sure to attune your pendulum by stating a fact, such as "My name is..." to see which way it swings to mean a "yes".  State a falsehood to see which way it swings for a "no". Pendulums can swing back and forth and up and down, or clockwise and counter-clockwise.