Native Americans have long believed that wearing a hand-carved arrowhead, as a talisman around your neck, was a symbol of protection, courage and strength. They also believed that the arrowhead protected them from illness and acted as a guard against the Evil Eye. It would deflect any negative energy, protect them from their enemies and absorb their power.
Tree-Agate is an excellent stone to use as a personal talisman. It will help your body gain physical, emotional, mental, and spiritual strength. It will give you the stamina to handle everything that you're supposed to do and everything that's expected of you. ... Tree-Agate is a stone of inner peace.
Black Agate, like all black stones, is a grounding and protective crystal. It gives a calming peace that helps those during a period of bereavement. Black Agate gives inner strength to move on and is also very helpful in keeping the peace in stressful households.