You can cleanse your crystals with other crystals. Selenite is one of the most popular crystals used to cleanse and charge other crystals and stones due to its powerful energetic properties and the ability to charge itself.
White Sage smoke is also a great tool for cleansing. Hold above a stream of the sage smoke with the intention of cleansing it. I like to then cleanse myself by swishing the smoke around myself. Feels yummy.
Sit comfortably and take in a few gentle breaths. Scan your body for any areas of tension and release. Once you feel relaxed, visualize a bright white light lovingly surrounding your jewellery. Continue until you get a sense that the cleansing is complete.