When working with nature, as in gardening, ritual or elementals, use crystals in their natural forms. When using gems and crystals for yourself, tune in to the shape that feels right for you. Man-made shapes actually harmonize beautifully with the human body. So much of the construction and function of our bodies is circular, cyclic, or in various geometric configurations. The application can be very literal, such as holding little spheres helps the eyeballs, eggs help glands, and slabs are great for teeth.