Modern day we understand a bit more about the crystal and how it interacts with technology and energy. We know that crystals can produce and conduct energy and recently learned that they can convert it. The National Institute of Health has an interesting article about the earth and how it is electrically conductive and how this may interact with a bio electrical environment that our bodies can use. Read more here.
Practitioners believe there is an energy grid around and within everything on earth, and how we react with it may benefit us. We often use them combined with color. Crystal and color therapy may work with our bodies energy.