Rosalie Claudel

Florince's Otome, the Abyssal Jade (深淵の翡翠 Shin’en no Hisui), formerly the Malachite of Purity. She was planning on retiring and marrying with Akane's appointment to her position, but was forced to remake her contract with the king of Florence using a new GEM when Akane ran off with Kazuya instead.
-From Wikipedia