1. Never hang pearls. This weakens the silk threads holding the necklace together.

2. Never store your pearls in any type of plastic bag. Plastic can emit a chemical that will cause the pearl’s surface to deteriorate.

3. Never leave your pearls near a direct source of heat (e.g., fireplace mantel, ­television set, stove).

4. Never store your pearls in a very dry room or in a safe deposit box for a long time. Pearls need a little bit of moisture or they’ll dry out.

5. Never allow your pearls to make contact with any chemicals found in household cleaners, perfumes, cosmetics, and hair-care products.
 
Sources: Cultured Pearl Association of America and Jewelry Information Center