“That's what Batman had to become an adult.”
It was at this time in her life that Rouge the Bat became the skanky criminal she is today. Given jewelry for her Bat mitzvah present, she became obsessed with gems. Since the ceremony marks the time of accepting responsibility, she takes full credit for all her major jewel robberies. She would only steal from Jewish jewelers, which is about all of them, if you know your stereotypes. Rouge herself is the obsession of pubescent neo-Nazi boys who are unaware of her roots and would rather fantasize about cartoon characters with tits versus human women.