Gemstone Pendulum. Real Amethyst Pendulum Pendulum dowsing can be used in a variety of different ways. In its most simple form, you can use it to answer questions or aid in decision making. Pendulums can also be used for: Healing purposes and identifying allergies. To cleanse and dispel negativity in a room. To help you find lost objects or pets. To find water or ley lines (dowsing rods are often used for this too, which work in a similar way to a pendulum).