chatoyant

[shuh-toi-uhnt]
adjective
1.
changing in luster or color: chatoyant silk.
2.
Jewelry. reflecting a single streak of light when cut in a cabochon.
noun
3.
Jewelry. a cabochon-cut gemstone having this reflected streak, as a chrysoberyl cat's-eye.

Origin:
1790–1800; < French, special use of present participle of chatoyer to change luster like a cat's eye, equivalent to chat cat1 + -oy- v. suffix + -ant -ant

chatoyance, chatoyancy, noun
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World English Dictionary
chatoyant (ʃəˈtɔɪənt)
 
adj
1.  having changeable lustre; twinkling
2.  (of a gem, esp a cabochon) displaying a band of light reflected off inclusions of other minerals
 
n
3.  a gemstone with a changeable lustre, such as a cat's eye
 
[C18: from French, from chatoyer to gleam like a cat's eyes, from chatcat1]
 
cha'toyancy
 
n

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Example sentences
Quartz is slightly smoky in all cooling units and chatoyant alkali feldspar is common.
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