Agate's most noticeable propertiesoverall are balancing yin/yang energy, courage, protection, healing, and calming. Historically it was placed in water for cooking or drinking to dispel sickness. Agate is a stone of strength. It was used by the Ancients on the breastplates of armor to give warriors strength and make them victorious in battle. Energetically, it is considered to give strength in both battle and physically.