The term onyx is said to have been generated from the Greek word onux, which means fingernail or claw. The most well-known Greek mythical legend goes that one day, Cupid/Amor, the god of love, used one of his arrows to cut the fingernails of his mother Venus. As her nails fell from Mount Olympus into the sacred Indus river, they metamorphosed into Onyx as they were believed to be divine. In ancient Greek, onyx means the nail of a claw or finger.
In ancient Indian and Persian tales Onyx is referred to as a protector from evil. The Indian gemologists describe onyx as a protector for harmonious relationships. The stones’ close union and yet strong contrast between the layers of black and white are considered symbolizing for the love between two people.
Even in astrological terms; it was believed Onyx to give power and courage and assigned onyx to the star signs of Leo and Capricorn, which were known as the most ambitious signs according to the Zodiac at that time.