Clayvision Girl Little Sister (Flat) Charm Necklace w/ 4mm Blue Zircon Colored Crystal December Clayvision original design. The charm measures about 1/2" tall. The link chain necklace measures 18 inches and includes one 4mm genuine Austrian Swarovski crystal. The pewter charm is nickel plated and manufactured in the United States. Not recommended for children under 3 years of age or for pets.