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