Pearls are soft (Mohs 2.5–4.5) and organic. Treat them gently and they keep their lustre for decades:

· Put pearls on last — after perfume, hairspray and cosmetics.
· Wipe with a soft dry cloth after wearing.
· Store separately in a soft pouch, away from harder jewellery.
· Keep away from vinegar, chlorine and ultrasonic cleaners.