Once you have your collection of crystals for healing and have been using them over a period of time they can become less effective. There are many ways to clear crystals of negative energy. Here are some suggestions.

Keeping your crystals clean is very important since they work by both absorbing and giving out energy.

Place in sunlight, moonlight or rain for up to a day. Nature cleansing is the best way, but if you don't have anywhere outside to cleanse your stones, place them in a singing bowl to clear the energy through sound.