Pendulums are used for divination. They can be used in many ways. Yes/No/Maybe Questions. Cleansing and Energizing the Chakras. Dowsing for a certain object, material, person, etc. Can also be used with charts or a pendulum chart designed similarly to a spirit board

Smokey Quartz for Pain, grief, Protection, stress relief and depression 

The Lore and Properties of gemstones or symbols are not a replacement for medical advice and services