How does crystal therapy/work supposed to work in theory ?

I am afraid that you are going to spend the rest of your life getting annoyed and bored a there is not one scrap of empirical evidence to support the efficacy or reality of crystal therapy. You have clearly rejected the only demonstrable explanation so you are now left with nothing but unscientific garbage and the word of the charlatan psychic brigade. Enjoy your state of blissful ignorance.