Pearls are porous and will absorb hairsprays, perfumes, lotions, oils, and dirt that will eventually discolor them and make them lose their luster.  To keep yours looking their best, store them out of direct sunlight wrapped in a soft cloth.  They are also fragile and should never be placed in an ultrasonic cleaner.

Sterling silver is an alloy of fine silver and copper and tarnishes when exposed to air. To prevent tarnishing, store your silver in a plastic bag when not being worn. You can also use a Sunshine cloth to remove occasional tarnish.