Cleansing crystals regularly is necessary as they will absorb negative energy.
It is likely that your crystals may absorb vibrations not only from you, but from anything in the environment where they are located. To create positive energy within your crystals, you need to cleanse them frequently. This is important as their effectiveness for healing may be effected by negative vibrations within the stones. If you have been using them to heal health issues or when you were in a negative frame of mind, they would probably have absorbed your negative energy. This is why it is a good idea to purify them on a regular basis.
If you have been thinking about why you should cleanse your crystals, and you use them regularly, understand that your crystals are tools. You need these tools to be at the highest vibration possible, so that you may receive the most benefit from using them.
Kyanite, Citrine and Selenite will not need cleansing as they are self cleansing and do not hold onto any negative energy.
To cleanse your crystals you can either run them under tap water or sage them. I prefer to use rain water to cleanse my crystals after every treatment. Some websites state soaking them in salt water but I personally think it is too corrosive.
After you cleanse them you will need to charge them.
How do I charge my crystals?
ou can leave your crystals in sunlight or moonlight be careful with certain crystals such as Amethyst as it will fade in the sun. You can also place them onto an Amethyst bed or charging plate. Some people bury them back in the earth to charge as long as you can remember where you buried them!
They work hard to remove negative energy so will need cleansing and charging often.