chatoyance

/ʃəˈtɔɪəns/
noun
  1. A changeable luster or color effect, like that of a cat's eye, seen in certain gemstones (such as chrysoberyl) or fabrics.
    • Jewelers value chrysoberyl for its chatoyance, which creates a sharp band of light across the stone.
    • The gem's chatoyance made it look like a real cat's eye when moved under the light.
    • The silk fabric had a subtle chatoyance, shifting from gold to green as she walked.
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