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Why a pearl can not hold its luster for ever?
Author: Source: Publish time:2010-11-25

Why a pearl can not hold its luster for ever? Because pearls have life Span. Losing luster means a pearl is growing old.

Pearls are conceived by shells. The luster and the body of pearls have life span. The life span of pearls is longer than the life span of a human being. However, if a pearl has been exposed in the air for long time, the surface of pearl will be oxidized and its color turns from white to yellow. The surface of a pearl will be chapped after long existence. In the end, a pearl will turn to residua.

Scientific research shows that pearls are calcium carbonate crystalloid composed by the bodies of shells through special colloid. Each piece of pearl has more than 90% calcium carbonate and about 4% water. Due to the water contained, a pearl keeps its shinning luster. It is easy for a pearl to lose water  after long time no use. A pearl will turn to yellow after its existence for sixty /seventy  to one hundred years.

Aging degree of a pearl is relevant to the appropriateness of its storage. Take an example, there was a big pearl on the small cap of the Emperor Qian Liong. It was passed to the Emperor Pu Yi after generations. The luster of the pearl still survives after more than two hundred years although in the normal situation it would turn to yellow due to its age.
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