How to Cleanse & Charge Crystals

Salt water
Crystals can be held under running water or immersed in sea or salt water to wash negativity away. Be careful that the crystals do not dissolve in water before using this method as it is not suitable for all types of crystal.
Salt purifies and absorbs negative energy. (Note: Some crystals disintegrate when wet. Common stones that can't get wet include: amber, turquoise, red coral, fire opal, moonstone, calcite, kyanite, kunzite, angelite, azurite, selenite.

Lighting a Sage Smudge stick and running crystals through the smoke will purify them and cleanse them. Be sure to set your intent whilst cleansing them in this way.

You can pass your crystals through the light from a candle to repurify them and surround them with light.

Charging Crystals
Placing crystals in the moonlight for a few hours can charge them. But the Full moon's are the best times for charging your crystals.