Gem use question.

Originally posted by Borg:

I have an Air1 mage, I have the air Gems, and when I pop open the roster to point out his battle spells to cast , some of the spells are shaded (like Lightning Bolt).

I guess he can cast a spell above his lvl if he uses a gem for it , Correct?

But HOW EXACTLY do I do that ?

You can still select the shaded out spells. And as long as he has the gems or other path-enhancing boosts (communion etc) he'll cast them.