Charging

How to charge your crystals:

In the sun (ensure they are not crystals that will fade in sunlight eg. Amethyst, citrine, etc)

Under the full moon light

Placing on a crystal selenite plate

Placing on a larger crystal geode

Cleansing

How to cleanse your crystals:

Washing in the ocean, lakes or rivers (ensure they are not water-soluble crystals e.g. Selenite, Kyanite)

Burning sage or palo santo

Sound frequency using sound bowls or instruments that emit high vibrations

On the earth overnight or even burying them (if tumbled stones)