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