The Crystal Gems - Garnet, Amethyst and Pearl - are three of the toughest heroes on earth. They are also mentors to Steven Universe, a gem/human hybrid boy whose mother was a great Gem leader. This guide, told from Steven's point-of-view and written by the show's creator, Rebecca Sugar, is packed with facts about the Crystal gems' powers, abilities and origins. It also includes original art and a special introduction from Rebecca Sugar. This book is a must-have for any Steven Universe fan!