Sardonyx and other onyx were used by the ancient Egyptians, Romans and Greeks in building, art and jewelry, including seals, rings and cameos. The Egyptians wore scarabs carved of sardonyx for good luck, and the mineral was engraved with the symbols or images of Greek and Roman gods like Mars and Ares and carried into battle to ensure courage and victory. Sardonyx was also believed to lend the gift of eloquence and persuasiveness to Renaissance politicians and leaders. Sardonyx, like many stones, can be worn as a pendant or carried as a hand comforter. Physically it has its best effects when laid upon the stomach. Sardonyx has long been used in rituals and has been a stone used in the breast plates of high priests since antiquity. Primarily used in protection rituals, in ancient Rome, it would have been used with a figure of Hercules or Mars engraved upon it. For good luck, it would also be engraved with an eagle's head and set in silver or gold. In other areas it has been known as a stone of "virtue" for those who speak to the public as it is said to bring about clear, concise and truthful speaking. The sardonyx is known as the "gem of courage" for orators and bashful lovers. It was said to be a charm against such assorted afflictions as warts, boils, and cramps.