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Pearl is very beautiful, but the singularity. We must pay special attention to maintain. low hardness is the first shortcoming of the pearl. Its Mohs scale is only 3.5, is much less than glass. Therefore, it is easy to cut through hard things, such as iron, glass, etc. Its brightness is also easy to use out in the dust.
Ownership of the gemstone is more stable, such as diamonds, rubies, sapphires, etc. In short, Gemstone feature will remain unchanged even after tens of thousands of years.

However, the pearl is just the opposite. We know that the main component of the pearl is aragonite is a mineral Aragoneses unstable, and has an automatic tendency to changes in other calcite mine. When that happens, turn yellow and lose their pearl pearlescent beautiful, and is an irreversible process. This has resulted in an ancient Chinese proverb says, “Men grow old, grow yellow peals, which means no output.
The jade and precious stones for more than ten thousand years can often be completely withheld so far, but can be difficult to see an antique pearl thousand years ago. The reason, I fear that is related to the property of the pearl aragonite its main component can be automatically transformed into calcite.

Aragon, the main component of the pearl, the chemical compound is calcium carbonate, the same thing with white marble and marble, that the use of stone in construction. The property is very volatile chemical, it is easy dissolved in acid and acetic acid, you can even eat through the chemical property. At the same time, it is best to keep away from cosmetics, oil, alcohol, gasoline, vinegar, salsa, and sweat, all you can eat the pearl’s surface and tends to the deterioration of brightness, or make the paint Pearl spotted. Because often in contact with the skin, when not in use, the necklace of pearls, or pearls should be washed with detergent, wipe the oil onto her dirty, rinse and dry.