Store pearls in a soft cloth pouch or wrap them in a soft cloth. Pearls are a soft gemstone material and should be treated delicately; they require moisture to prevent them from becoming too dry and brittle, so avoid storing in plastic bags, which do not breathe.
Never use ultrasonic cleaners or steamers. Wipe gently with a soft cloth after each wearing or, for more thorough cleanings, use mild soap and water.
If knotted, make sure cord is completely dry before wearing.