nacre

/ˈneɪkər/
noun
  1. A smooth, shiny, iridescent substance that forms the inner layer of some seashells, especially oysters; mother-of-pearl.
    • The inside of the oyster shell was lined with beautiful nacre.
    • The nacre on this antique brooch still reflects rainbow colors after a hundred years.
    • Jewelry makers often use nacre to create elegant, shimmering buttons and inlays.
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