Some simple methods of energizing a crystal include leaving it in bright sunlight for a day, with the suns warm rays shining full on it. You can also use other crystals to assist in the cleansing and energizing process. A cluster of clear quartz is excellent for this. Simply sit the stone on the cluster for a couple of days. I would suggest that stones you are using to purify and energize others be cleansed on a regular basis, to rid them of any negative energy they have absorbed out of the other stones.
You can also program specific personal energies into a stone. First you need to choose a stone whose properties basically fit your requirements, and then you can narrow it down with your own energies. After the stone is fully cleansed, sit comfortably and hold the stone in your projective hand (right if you are right handed, and vice-versa). Picture the energy you want the stone to hold, and imagine this energy, whether it be love, wealth, protection, clairvoyance etc, flowing through you and into the crystal. Again, visualization is the key factor here. The more you can concentrate, and really SEE that energy flowing into the stone, the more effective the programming will be....<<<Read More>>>...