From the pattern description

All of us can use a little positive energy in our lives, and carrying around a symbol of luck might help. Who knows? One of these little amulet bags would make a great gift for someone you are concerned about. Add an angel, an acorn (for good luck and long life), or, as we’ve shown here, a piece of turquoise (the stone of happiness, health, and good fortune) to a hand-knit bag.