Overview: Onyx has been used for thousands of years for a wide range of purposes. This stone has been carved and used for art and tools since Egyptian times. Onyx is a very powerful protection stone, used to protect your aura or space from negative energy. This makes Onyx a very popular stone for jewelry and to use in your home decorating. Onyx helps ground and protect your root chakra and is a very protective stone. You can place this by your bed to help regulate sleep and use during meditation to arrive at clear decisions.