In nature, crystals are always transmitting their energy. When we use them, we drain them. Like a battery, they need time to be re-charged before we can re-use them. There are numerous methods cited for the cleansing and clearing of gemstones.
Cleansing Your Crystals
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More specifically, used crystals should be cleansed, follow by charging.
Cleansing is to remove any negative energy locked inside the crystals while charging, is to restore the energy level of the stone.
Want to effective ways to cleanse and charge your crystals?
For charging: http://www.crystalsbay.net/crystal-charging.html
For cleansing : http://www.crystalsbay.net/crystal-cleansing.html