* Nacre: Pearls are formed by layers of nacre (a combination of aragonite and conchiolin) secreted by a mollusk. This nacre gives pearls their luster and iridescence.
* Delamination: Over time, or due to exposure to certain elements (acids, chemicals, dryness), the layers of nacre can separate or delaminate. This results in flaking or peeling.
* Artificial Pearls: Fake or imitation pearls can also peel, but it's often due to the coating being worn away, revealing a plastic or glass core.
Reasons for flaking/peeling in real pearls:
* Age: Pearls are organic gems and can deteriorate over time.
* Exposure to chemicals: Perfume, hairspray, cosmetics, chlorine, and even sweat can damage the nacre.
* Dryness: Pearls need a bit of moisture. Dry environments can cause them to become brittle.
* Improper storage: Storing pearls in airtight containers can dry them out.
* Acidity: Exposure to acidic substances can erode the nacre.
In summary:
Flaking or peeling is not a normal or desirable characteristic of a healthy, well-cared-for pearl. It indicates damage and potential degradation of the nacre.