所以真珠质的厚度就像脸上化妆品，不久就会磨薄了。
As a resul t, nacre thickness is sometimes just a cosmetic layer t hat can wear thin over time.
天然珍珠和人工养殖珍珠会有些许粗躁的感觉，如同细砂纸般，那是真珠质的天然触感。
Cultured and natural pearls will feel slightly rough , like fine sandpaper , because of the texture of natural nacre.
珠蚌不但更小，生命力更弱，受到污染的水会改变真珠质和珍珠的颜色。
Not only then are the smaller, less robust creatures but the pollution in the water changes the color of the nacre and changes the color of the pearl.
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