| 31. | Keshi pearls consist of solid nacre, and tend to have high luster as a result.
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| 32. | The color of the shell is yellowish white on the thin calcareous layer overlying the nacre.
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| 33. | The nacre is pink or purple.
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| 34. | When the transition to nacre secretion occurs, the brown pebble becomes covered with a nacreous coating.
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| 35. | Nacre is found in some of the most ancient lineages of bivalves, gastropods, and cephalopods.
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| 36. | Instead of using a marble or tile base, the nacre tesserae can be glued to fiberglass.
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| 37. | The microscopic structures in bone and nacre are lamellae in the materials science sense of the word.
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| 38. | Inside the shell, the nacre has a sheen which is white, blue, and silver.
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| 39. | The surface is lusterless, the dull outer layer very thin, overlying a brilliantly iridescent nacre.
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| 40. | Acids tend to eat away nacre or dull the lustre when exposed over a long period of time,
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