Materials, Size Natural Stone Power Stone Green Glass Agate 8mm beads Wrist size approximately 16.5cm Unisex size. Green Glass Agate Green agate has the "power to strengthen bonds" that agate inherently possesses, and is said to deepen the bonds and love between parents and children, and siblings. In addition, it is said to help maintain health and aid in the treatment of illness, and it is said to absorb negative energy.