Cleansing crystals (cleanyourcrystals.com) is an essential practice in maintaining their beauty and metaphysical properties. It involves various methods, each tailored to the type of crystal and its specific needs. Common techniques include rinsing them under running water, which is believed to wash away negative energy, and placing them in moonlight or sunlight to recharge their natural energies. Some prefer smudging with sage or incense, a practice thought to cleanse both the physical and spiritual impurities of the crystal.