Clayvision Hedgehog Porcupine Charm Earrings with Blue Zircon Colored Swarovski Crystals December Clayvision original design. The charms measures about 1/2" tall. The charms are attached to surgical steel wire with genuine Swarovski crystals. The pewter charm is nickel plated and manufactured in the United States. Not recommended for children under 3 years of age or for pets.