16 gauge blue opal gold daith hoop ring, rook hoop, cartilage hoop, helix or tragus hoop, or septum hoop. A blue opal centered around a lacey hoop is made of 18kt gold plated brass. The hoop is 8mm in diameter. Choose your color wire wrapping, shown with blue. The hoop twists to open and close. All orders arrive in a gift box.