Gorgeous Topaz Crystal Ball Charm for Cat or Dog Collars. A bit of shimmering topaz colored Austrian Crystals will dress up any dog or cat collar. Crystal Ball charm is now available in white with diamond crystal stones. Pet Collar Charm measures 3/4 inch in diameter and is lightweight and sparkly. Comes with lobster clasp to make switching charms from collar to collar a snap. Free Shipping Inside the USA.