Crystals emit energy, different kinds emit different frequencies. You may be able to feel the energy from a Crystal if you hold it in the palm of your hand, close your eyes and relax, you may sense a slight pulsating energy.
Crystals have long been used for their healing properties. We have energy centres in our bodies called Chakras. These are located down the centre of our bodies from the crown to the base ( genital area). Each of these Chakras can get blocked or the energy flow out of balance, eventually causing physical problems and illness.
Crystals can be used to balance the energy by being placed on or near the body. Different Crystals will affect different energy centres, for example, Rose quartz is believed to help the flow of energy in the heart Chakra area and Amethyst for the third eye (forehead) Chakra.