At their heart is a crystal which generates natural electromagnetic frequency which can tune in radio waves. So, the theory goes, you can wear a crystal to get in tune with the natural electromagnetic energy of the earth. It's healing, aligning, good for what ails you. There's a relaxed but alert state of concentration which corresponds to maximum physical and mental performance. You're lucky if you are.
Some people seem to have been.
People have wondered about that for ages. They've consulted oracles and sages and prognosticators of all kinds. The most popular methods of divining it all these days is Astrology and Numerology. You can belive or not. Most people wonder.