7 Chakras Tree Of Life & Matte Black Agate with Tibetan Bead Center Piece. The 7 healing crystals or gemstones power always bless you in the form of a bracelet. It improves intellect power, creativity and self-respect. It brings good luck to your life. Enhance the emotional and physical balance and remove the fear and anxiety. Black Agate is used for Protection, Courage, Success. ... Black Agate is excellent as a healing crystal for respiratory issues, eases nausea, indigestion, cramps and problems of the teeth and gums. Agate is used for treating dizziness, headaches, as well as skin problems. 8mm beads. Standard size.