1. When the pearls are later harvested , the oyster has covered the bead with layers of nacre
  2. As a result , nacre thickness is sometimes just a cosmetic layer that can wear thin over time
  3. Fine pearls do not have any flaws or spots in the nacre : it has an even , smooth texture
  4. Recent advances in nacre used as bone implant are reviewed in this paper
  5. Pearls are organic gems , created when an oyster covers a foreign object with beautiful layers of nacre
  6. It's difficult to find nacre in a sentence. 用nacre造句挺難的
  7. It is likely that nacre will become a good candidate for bone graft substitution in future
  8. The pearl continues to grow in size as thousands of layers of the nacre continues to build around the pearl
  9. Cultured and natural pearls will feel slightly rough , like fine sandpaper , because of the texture of natural nacre
  10. When selecting a pearl , consider that the larger the pearl , the more nacre it has , so it will also exhibit even more luster
  11. 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
  12. The pearl begins when the mollusk secretes a lustrous substance , called nacre , that coats the irritant and protects the soft internal surface of the mollusk
  13. 5 a round to near - round ; moderate / low luster ; thin nacre ( less than . 2 of total nacre ) ; 60 - 70 % inclusion free surface ; good to moderate matching
    5 a圓到接近圓的程度,中/低的光澤,簿的珠層(小于0 . 2的珠層含量) , 60 % - 70 %的表皮光潔度,良好到中等的匹配。
  14. A tiny bead is implanted in an oyster , so that it is gradually coated in layers of a beautiful , pearlescent substance called nacre which build up to create a lustrous pearl
  15. 7 commercial quality near - round to off - round ; moderate / low luster ; thin nacre ( less than . 2 of total nacre ) ; moderate to heavy inclusions ; good to moderate matching
    7經濟級的質量,接近圓到不圓,中/低光澤,簿的珠層(小于0 . 2的珠層含量) ,中等到大量的瑕疵,良好到中等的匹配。
  16. As an oyster creates a pearl , the layers of nacre do not always adhere smoothly . sometimes spots and bubbles can appear in the layering process
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