All jokes aside, I'm quite looking forward to trying this experiment. ...
Can you tell us a little bit more detail about specifically what you are doing? I mean, in a step-by-step description (what I like to call "peanut-butter-and-jelly" instructions. ; ) ).
Also, remember that this experiment is rather complicated by the fact that there are actually several undemonstrated things to demonstrate:
1) That there is such a thing as an "aura".
2) What this aura actually is (i.e., electromagnetic energy? something else?), and how to measure it.
3) That a person can feel changes to this "aura", and that such changes are distinguishable from the placebo effect.
You've mentioned that it can take several days for you to notice a change. This in and of itself raises some problems: since the topic of this thread is healing, be advised that many minor conditions take a few days to clear up; if a person reports that his/her symptoms are gone in a few days, it may not be due to crystals affecting an "aura", but simply a result of the condition clearing up on its own.
Also, noting that you feel different over a several-day period isn't really a good test, either; changes in your body chemistry (due to different foods taken in over the period, different levels of hydration, different levels of stress and/or fatigue, etc.) could easily account for a change in mood over such a time.
So for a good test, you have to find something that does not fit either bill -- won't clear up on its own, and is not so subtle as to be indistinguishable from everyday normal body functions -- and it has to happen consistently enough that you can test it in a reasonable amount of time.
I state "reasonable amount of time" because if you're blinding your test even half-way appropriately, it takes a little bit of set-up -- of infrastructure. It can't just be person A "combing" person B whenever person A feels under the weather. There has to be a way to control for the placebo effect, and that means that person B (and, actually, person A too, for a true double-blind test) does not know whether the crystal is being used. That's a bit more involved.
So, since option #3 is going to take many, many weeks, you might want to see if you can't concentrate on options #1 and #2, and find something that's a bit easier to test and control. For example, how do you know there's an "aura"? Can person A feel the aura through the crystal? How far from the body does this aura extend? And so forth. If you approach it that way, it shouldn't be at all difficult to set up a test that won't take months.
