Sardonyx is known for its strength, protection, and courage. It is often used in jewelry and decorative objects due to its beauty and durability. Historically, it has been associated with strength, protection against malevolent forces, and unity and harmony. Sardonyx is also believed to have healing properties, particularly for digestive and circulatory issues, and it can help with mental focus and concentration. Additionally, it is known to enhance motivation and provide a sense of stability and protection for its wearer.