Banded Agate Pendulum. Often called the “earth rainbow”, Banded Agate is a healing stone for body, mind and spirit. It can increase concentration, honesty and memory. Banded Agate also protects the wearer from psychic attack, thereby preventing negative energy from harming you. Pendulums are often used as tools for spiritual healing and inner growth. Defined as objects attached at the end of a string or metal chain, when suspended from a stationary position, a pendulum will swing back and forth or in a circular motion.