Do you want to compare John Constantine with Amethyst? Discover the powers, weakness & weapons of John Constantine and Amethyst from John Constantine Biography and Amethyst Biography. Find out all about John Constantine and Amethyst.# Check out how is John Constantine unique and distinct from Amethyst. Discover their love interest, sidekicks, family tree and the movies and games list in which John Constantine and Amethyst have appeared. Find out everything about them here!