Crystal healing works because the stones interact with your body's own natural subtle energies. Each crystal holds a vibration, much like chakras hold a vibration of color and energy. Crystals used to heal each chakra usually vibrate with the same color associated with that chakra. Edgar Cayce recommended illuminating a clear quartz crystal with the color of the chakra you wanted to heal, then to gaze on that crystal as you sang a mantra associated with that chakra (L A M for the Root Chakra) or repeated an appropriate affirmation. Even a photograph of the crystal holds the vibration.
Gaze at the photo here while toning L A M and notice how you feel safer, more grounded and more secure.
For photos, sound mantras and affirmations associated with all seven of the major chakras, see my new Kindle book, BALANCE YOUR CHAKRAS, BALANCE YOUR LIFE.
Becca Chopra, author of The Chakra Diaries, Chakra Secrets, Balance Your Chakras - Balance Your Life, and the Balance & Tone Your Chakras DVD