[@Akayaofthemoon]
How about Frostbite its the ability to freeze another's body to induce rigor mortis in an organism? It can freeze up any part of an entity's body where one can turn the tissues and flesh into solid ice making the victim shatter into pieces due to freeze drying, or cause a swelling making it hard to move for the victim. And in this case it could be another gem's limb or maybe the gem it self has well if she gains enough control and confidence to do so.