Mainly exist three reasons by which pearls can turn yellow with the passage of time: The first and more habitual reason , corresponds to a homogenous yellow and lost of luster, remembering to us the aspect of plastic. It is because there are a type of pearls denominated Akoya (the classic Japanese pearls), characterized for being perfectly round, effect that is obtained inlaying a plastic ball, of similar dimensions of the final pearls, to the Akoya oister so that this covers it with a fine nacre layer. Thus this pearls will be perfectly round, but on the other hand the fine nacre layer with the use will be worn away and the plastic material that there is in interior will be appearing by the nacre layer giving a yellow aspect (the used plastic yellows with the ultraviolet light, to pave). In this case there is no remedy, because there is no nacre.

The second reason is accidental, and it takes place when an acid makes contact with the nacre of the pearl. Saving the differences, the chemical behavior of nacre is similar many aspects to the one of the marble. One is resistant surfaces but they are stained with acids. The perfumes, some lacquers, or special soaps can contain compound of acid character that damage nacre. If this take place, single the zones of contact will probably suffer injuries and not all the pearls. In this case there is no remedy, because it is not possible to replace the damaged zone and single in very precise cases it can be used products that neutralize to attacking acid. +CONTINUE