Clayvision Hedgehog Porcupine Charm Necklace w/ Sapphire Colored Blue Crystal September Clayvision original design. The charm measures about 1/2" tall. The link chain necklace measures 18 inches and includes one 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.