All metals will begin to oxidize when exposed to air so a certain degree of tarnishing is to be expected. We recommend that you keep your items stored separately in either an airtight bag or box which will reduce tarnishing and help avoid tangles and other damages. We suggest that you do not sleep, swim, shower, bathe or exercise in our jewelry in order to avoid a build up of body oils and exposure to chemicals and minerals. Apply lotions, creams and perfumes before you put your necklaces and bracelets on. Pearls should never be worn in the water. Do not use a polishing liquid on Dana Kellin jewelry or submerge in polishing/cleaning chemicals of any kind. Instead, please use the enclosed polishing cloth. Place your piece of jewelry flat on a rag, brace it with one hand and gently rub it with the cloth the other hand. After use, wash hands and store your cloth. It can be used multiple times.