It is basic that you cleanse your stones to enhance their energy, there are many types of ways to do that.

WAYS TO CLEANSE YOUR STONES:
Soak in spring water
Soak during rain
Breathing visualization
Moonlight
Wash with sea water
Place on a self cleanse crystal like clear quartz or amethyst
Smudge sage
Tibetan Singing Bowl
Sunlight
Bury in sand for 24 hrs