1. To create a knighthood order. Some orders require a Qualis gem, others do not and require something else. Refer back the Wiki page by clicking here
2. Discover the location of the hidden mines of Al-Aziz. When you find Brother Randalf you have the opportunity of giving him one Qualis gem in exchange for the location. You would require more gems for when you enter the mines, I suggest if you're serious about it to refer to my other thread, Al Aziz - the definite thread
3. Finneas de Figt can give you an elixir in exchange for a Qualis gem. The elixir gives you an extra 2 Strength and 2 Agility. It is rumoured that it also helps with something else, as in not losing your luck, age, renown or skills (not confirmed).4. (hidden) You can use a Qualis gem to gamble. This is an easter egg. Go talk with a townmaster in any town. Ask him for a job (quest). Then ask him "What if I can't make it (the quest)?". He'll then answer if you like to gamble and explain what it will do. Gamble with him at your own risk. Once you press "Yes", and if nothing seemed to happen, it means you won. Get out of the dialog and check your party, you should have some nice elite units. I have had, only one type of these troops, either Knights of the Falcon, or Knights of Dawn, or Jatu Lancers, or Noldor Twilight Knights, or Noldor Rangers, or Omen Seekers (30 of them, best bang for the buck out of all the other choices, you'll see why when you get some), or Singalian Horsemen (not really elite here), and some others I don't recall. If you lose the gamble, you lose a Qualis gem. Your choice. Of course that, if you're a save scum, like I try not to be, ahem, you can go back and try again. Obviously, save before entering a town. I have tried this when I had 2 Qualis gems in my inventory.