真珠质 meaning in English

nacre

As a result , nacre thickness is sometimes just a cosmetic layer that can wear thin over time
所以真珠质的厚度就像脸上化妆品，不久就会磨薄了。
Fine pearls do not have any flaws or spots in the nacre : it has an even , smooth texture
在这些透明的真珠质层上反射和衍射所形成的。有些珍珠会有
Cultured and natural pearls will feel slightly rough , like fine sandpaper , because of the texture of natural nacre
。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。
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
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。