www.bjbead.com tells you the reason of the pearl bleaching

Although the color of fresh water pearls are beautiful, but can not stand the test of time. In general after more than ten years, will become an ordinary pearl yellow, while the loss of the beautiful luster of freshwater pearls, and that is saying the word "人老珠黄."
Freshwater pearl jewelry with a long time so why yellow? This is mainly composed of pearls of the physical properties of the mineral aragonite instability, over time, it will become common calcite. All aragonite calcite, although the same chemical composition, and their crystalline form and as little gloss. This is the pearl of the reasons for change

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