Wholesale Prices in Price Matrix, Sold by the egg. The cats eye worry stones eggs are made from fiber optic glass. They have been shaped, smoothed and polished and are bursting with brilliant colors. The worry stone purpose is for stress relief and metaphysical healing. Drop one in your pocket and rub it between your thumb and index finger. The power of the stone is said to take your worries away. Size 25mm x 18mm. Makes a great craft item.