If you're genuinely fascinated, there's a plethora of books, websites, forums, etc to choose from to further educate yourself. I don't use stones, so I can't answer those questions. I mainly do hearth and kitchen magic with a focus on hoodoo, the magic of my ancestors. I see magic as a respectful manipulation of the energy that is all around us.
Sometimes magic is simply courage, sometimes it's something more. It all depends on the user, the spell, and other factors.