The semi-precious stone and its meaning are highlighted on the back on each card and connect to the photograph on the front of the card. Each playful stacking bracelet incorporates semi-precious stones along with Japanese glass Miyuki beads.Materials: Miyuki delica beads, semi-precious gemstones, and plated brass.Pull the tails to easily adjust the bracelet size.Hypoallergenic. Nickel and Cadmium free. Green Aventurine | Stone of Optimism