Just like any other tools, crystals need to be cleansed & charged.
What does in mean to cleanse crystals?
Cleansing crystals means removing negative energy or vibrations that may have accumulated in them while you use them. Ex - Negative energy that may have got stored in your crystal while you had them on you in a tough situation or while you were going through anxiety or stress.
These negative energies need to be cleansed for the crystal to keep working it's magic.
Here are a few ways to cleanse your crystals -
After you've cleansed your crystals don't forget to charge them using your intentions -
Focus your energy & thoughts on what you want to achieve using the crystals. Ex - You want more energy, you want more focus, attract abundance or reduce stress. Whatever it is, hold the crystal in your hand & visualise your intentions.
Hold the crystal up to your heart center and imagine that you are breathing your intention into it. Visualize the energy flowing from your heart, down your arm, and into the crystal.
You can also speak your intention out loud, saying something like "I charge this crystal with the intention of attracting love into my life" or "I charge this crystal with the intention of bringing me clarity and insight."
Hold the crystal for a few minutes, feeling its energy merge with your own. When you feel ready, thank the crystal and set it aside.