- changing in luster or color: chatoyant silk.
- reflecting a single streak of light when cut in a cabochon.
- a cabochon-cut gemstone having this reflected streak, as a chrysoberyl cat's eye.
- having changeable lustre; twinkling
- (of a gem, esp a cabochon) displaying a band of light reflected off inclusions of other minerals
- a gemstone with a changeable lustre, such as a cat's eye
