Board Thread:News and Announcements/@comment-26864837-20150812012435/@comment-13044010-20150817143152

Steven didn't retreat into his gem when he was head butted as envidenced by his black eye, which would have healed if he did.

And if he did actually retreat into his gem at that part, then it means his gem can't fix an organic body. Which leaves us with 1 or 3. But that's just my opinion, his gem not have classified that as a serious injury.

Ps. I don't think that Steven's outfit will change if he can in fact regenrate since his cloths aren't a part of him like the gems cloths are. Also wouldn't Steven becoming a full gem literally mean he became an alternate regeneration of Rose?)