Black has been associated with regeneration and new beginnings. Black onyx is thought by some to have protective qualities, making it advantageous to carry when traveling. It is said to be useful in fighting basic fears and helping to move beyond bad relationships--as well as to heal old emotional wounds. The Romans associated onyx with courage and it is thought to be useful when one is defending him/herself against unfair criticism.

While ruby is the birthstone for July, black onyx is an alternative stone for the month and is associated with the Babylonian Zodiac sign of Capricorn.