How To Clean Pearls That Have Gone Yellow. Different types of pearl exhibit different types of lustre. Just be careful to closely monitor your dress if using this method.
When the juice and salt has all been wiped away, allow the piece to air dry. Your body oils also act as a moisturizer for the pearls, keeping them from drying out. Don’t put them for a long time in places where it’s hot and there’s no air circulation.
Pearls with low lustre appear chalky, yellow or dull.
Clean with a damp cloth only as needed. If they use a pearlescent material, dyed nacreous portion, or mollusc shell, then that reacts the same way a real pearl with nacre will, tarnish and turn colors over. Try a paste of lemon juice and salt. Not all pearls have overtone and it varies greatly in those that do.