What is Sardonyx onyx birthstone stone?

Sardonyx Onyx is essentially a stone that is responsible for energy source, especially to help people to recuperate from illness or after doing long, exhausting works. However, in sardonyx, thing is heated up a little bit. Instead of calm yet persistent energy building, the meaning of sardonyx stone for health is obviously to build vigorous and fiery energy as well as stamina. Therefore, this is a great stone to support activities of vigorous athletes.