Crystal Cadets — Anne Toole

Zoe is a shy girl, struggling to fit in at her new school, when she finds a mysterious gem left to her by her birth mother. All of a sudden, darkness-spewing dragons are chasing her down in the schoolyard, and a squad of crystal-wielding girls is there to save her! Welcome to the Crystal Cadets, Zoe; you're now the Diamond Cadet! Join Ruby Cadet Jasmine, Emerald Cadet Gwen, Garnet Cadet Olivia, Pearl Cadet Liz, and Sapphire Cadet Milena as a member of the toughest, smartest, and best-dressed team of evil-fighting girls in the world!