Pearls are not as hard as mineral gemstones, and they are organic. Therefore you need to treat them a little differently than your other jewellery.
The best way to keep your pearls beautiful is by wearing them. Your body's natural oils can keep pearls moist and lustrous. When dressing, put on pearls only after applying hairspray, cosmetics, perfume or other potentially harmful substances that might stain them.
Pearls are more fragile than most other gemstones. To prevent chipping, pearl jewellery should be stored in soft cloth, away from other harder jewels. Pearl strands should be stored flat rather than hung to avoid premature stretching of thread
Your fine pearl necklaces should be restrung periodically so that you're sure the silk or nylon cord holding them is in good shape. It is recommended that you restring pearls every few years as strings can wear down and break if not maintained. Do not get your strand of pearls wet as this can stretch the cord on which they are strung.