Nice
Very atmospheric and Indiana Jones'ish.
You not only have to spin the wheels slowly, you have to unclick your mouse to let it try to "set" in place. Just holding down your left-mouse button and spinning profusely won't work. You're actively trying to rotate and set the circles in a certain place. So, you have to rotate, release left mouse button, rotate more, release, etc.
My only complaint is that, yes, some of the puzzles were pretty obtuse. For the most part, I figured them out, but that one piece of topaz hidden ... well... I had to use the walkthrough for that, even though in hind-sight, you did give a clue for it.
I still like this game. Not much into point-n-clicks, but this was very good.