This is considered one of the safest ways to clear your crystals.

 

Sit comfortably somewhere quiet where you will not be disturbed and hold your crystal(s) in your hand. Close your eyes and breathe deeply as you allow the quiet to envelop you, take a moment to ground yourself, centre your energy and clear your mind. Once you have cleared your mind visualise your crystal(s) in front of you and picture white radiant light pouring over and surrounding your crystals. Envision the impurities leaving the stone enabling your stone to be renewed and shine brighter.