So Halting statement made me look over the gem powers again and I have a problem with only three.

1: [@Guardian Angel Haruki] The brainwashing poison is too much. Being able to control a gem's every action is not going to work. Especially since, in essence, she could force a gem to just kill itself and be done with it.

2: [@Vocab] I'm not sure how you plan on using this power but the only way it wouldn't be overpowered is if the emotions were mental suggestions. If the gem is already happy, forcing it to be sad would be impossible. On the other hand, if a gem is already feeling kind of "meh" it would be easy to make them sad or irritated. Already sad or irritated? Make them down right depressed or enraged. 

3: [@HaltingBlooper] I only have a problem because it is relatively weak. Since he's a newborn it makes sense, but eventually his power should get strong enough to pierce a gem's physical form and possibly poof them.