Premise: Amethyst: Princess of Gemworld is a comic book series published by DC Comics in the 1980s. The series tells the story of a teenage girl named Amy Winston who discovers that she is the orphaned princess of the magical Gemworld. Amy learns that an evil ruler called Dark Opal is out to destroy her and travels to Gemworld to overthrow him.
Hypothesis: Amethyst: Princess of Gemworld was inspired by a teen girl named Amy that was the author's little sister.