The third reason, is a natural degradation. Pearls are organic gems, are not mineral, reason why its composition can be altered in the time. Pearls extracted from it's natural enviroment, that are the water, has an approximated life of 150 years.

The outer nacre layers undergo the humidity absence can resecan them very slowly, getting long term to crack itself and in some cases according to the circumstances to yellow, as resulting from the incrustation of dirt in micro cracks.

In order to extend the life of the pearls is recommendable to pass them habitually a humid cloth, to level the humidity of the outer layers. A bath of pearls in a bicarbonate dissolution, will never damages the nacre, and can have spectacular effects, by its action of acid elimination and its capacity of elimination of dirt inlaid in the micro cracks. There are no possible negative effects over the pearls, but remember that to bath the thread of the necklace can debilitate it.+BACK