Onyx is said to promote personal strength and stamina, alleviate fears and worries, and to promote the health of bones, teeth, and blood.
Agate is known as a stone of strength, and was used by ancient warriors to impart strength in battle. It is also said to enhance self-confidence, energy, and emotional and physical harmony. It is considered a protective stone, especially for children.
Pietersite is said to help one relax and stay calm as it releases deep emotions, to help improve memory, and physically to improve digestive functions and nutrition. It is used to help physical conditions of exhaustion, confusion, headaches, and breathing problems.