Sardonyx is a multi-colored variety of banded onyx, which is a form of chalcedony quartz. Normally, onyx bands are black, but in the form of sardonyx they have alternating reddish-brown and white parallel bands.
Sardonyx is a highly protective stone that embodies a vibration of happiness, optimism and confidence. It helps to boost your self-control and your level of personal power. This stone creates an excellent grounding action through the earth and base chakras, and brings you back to earth after spiritual work.