Agate is a vitalizing stone great for bringing strength and protection. Among the oldest good luck and healing stones, it is said that Agate improves memory and concentration, increases stamina and encourages honesty. Agates are very grounding stones, and they bring about emotional, physical and intellectual balance.
Agate is said to strengthen the body and increase energy. They aid in centering and stabilizing physical energy. Emotionally, agate gives courage, emotional strength, self-confidence, and dispels fears. It can be very beneficial for self-examination as well as examination of the circumstances one finds oneself in. These qualities make agate superior for easing anxiety and stress.
Reference: Hall, Judy. (2003). The Crystal Bible: A definitive guide to crystals. Walking Stick Press.