Silver Moon & Star Belly Button Ring Twisty - 316L surgical steel twisty barbell, also called a helix, is made of quality materials from the United Kingdom. The twisty measures 14 gauge, 3/8" which is the perfect size for a standard belly piercing. The moon and star are made of .925 sterling silver, as is the setting that holds the clear, round gemstone.The externally threaded balls each hold a blue zircon gemstone.