Full moon is a great time to energetically clear and cleanse your crystals and gemstones. Clear Quartz crystals amplify whatever energies that surround them. So it is a good idea to periodically clear and cleanse them of any unwanted energy- bad moods, negative thoughts, arguments that kind of unwanted energy. This is especially important to do if you are going to use the crystals for healing.
One of my favorite ways to cleanse my stones is to put them outside under the full moon. The energy of the moon light washes away anything that is no longer needed. I like to leave them out all night and into the next day so they can be charged by the light of the sun. I happen to live in a very safe area where I can do this, but if needed place them by a window where the light of the moon can shine on to them. The day before the full moon and the day after are also acceptable times to cleanse your stones. You can place them directly on the ground or put them on a soft cloth and lay them on a table where the moon light will shine brightly onto the stones.
I often find that after I have placed my crystals in the moonlight, they have a brighter glow to them, shining, radiating and ready to be of service. All color gemstones can be cleansed by the moon too.
So get your stones out and give them a full moon bath!