Wholesale Prices in Price Matrix, Sold by the individually by the piece. There are 5 stone choices. Genuine amethyst, rose quartz, crystal, black onyx and opalite (which is a man made stone) worry stone - pulled at random. ( Picture is a example of the stones and the size and colors varies). Each worry stone has been shaped, smoothed and polished. The worry stones 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. Sizes vary from 1"L x 1"W x 1/4"thick to 1 3/4"L x 1 1/2"W x 1/4" thick. No two stones are the same because they are a natural item. There are multiple stones pictured to give you an idea of the unique look of each stone. Stones are sold individually and pulled at random. Also makes a great craft item.