Amethyst

At the spur of her eighteenth birthday, Adeleine made the choice to lose her youth and become a mature adult in her society. Her mother, the president and mayor of the capital of Diamandias and of the province of Sliverstone, unexpectedly has to leave for a business trip to one of the five Rebellion Cities around the capital. Everything changes when she turns eighteen exactly. Her mother is assassinated while on her business trip and her house is raided, leaving her step-father, Samas, to fend for himself while Adeleine runs to safety at the Rebellion City of Flint. At Flint, she meets four individuals, all that have a similar past and one thing that each of them share: a birthstone that can transfigure into a weapon.