Sard banded with alternating layers of red, black, and white is referred to as Sardonyx. It is the birthstone for the month of August. In Medieval times it was used primarily as a means of banishing grief and to bring about more control over the emotions so the wearer might become happier. It may also be used to disburse hesitation and find courage.
The power of eloquence is also associated with this stone, especially in matters of love. A hopeful lover might use sardonyx to gain confidence or assist in expressing their feelings before asking out their intended. It might also be used when you are experiencing a lover’s quarrel to help get you feelings out in the open. Attract friends, good fortune, and self control with this gem.
Sardonyx was said to dispel stupidity as well as tumors by the ninth century bishop of Mainz, Hrabanus Maurus. New Age doctrine says that sardonyx causes an antiseptic aura, warding off infections. It affects the vertebrae, thyroid, and larynx, and balances the metabolism.