Material: Green Aventurine Beads, Alloy Pendants. Because the bracelets are made of natural stone, each one has a unique color.Dimensions: Length: 6.2 inches (elastic), Tree of Life: 21*16mm, Beads: 8mm, Charm Beads: 10mmTree of Life: The Tree of Life, also known as the Tree of Knowledge, is depicted as a tree with many branches and roots, illustrating that all life on Earth is related. It symbolizes life, grace and peace.Green Aventurine: Known as the "Stone of Chance", Green Aventurine is considered the luckiest of all crystals, especially in embodying prosperity and wealth, or adding favor during tournaments or games of chance.