Helton, I get you find this system interesting, but... It makes no sense. It makes absolutely no sense what these jewels are even supposed to represent. When you have a traditional skill tree, I can understand that some skills are more complicated and require you to apply effort in a simpler one. But this system here just makes no sense whatsoever. It can be fun to play for a while, a bit like a JRPG, but making this the central mechanic of a bonafide RPG would make the resulting game much less interesting and relatable, I think.
I think it is really important for an RPG to be careful with its abstractions. There will be abstractions, of course, but they shouldn't be such that it makes in-game choices completely unrelated to the imaginative element. If you do that, what you are doing in the game stops making sense and becomes a completely abstract action.