In gemology, chatoyancy [shuh-toi-an-see], or chatoyance, is an optical reflectance effect seen in certain gemstones. Coined from the French ‘œil de chat,’ meaning ‘cat’s eye,’ chatoyancy arises either from the fibrous structure of a material, as in tiger eye quartz, or from fibrous inclusions or cavities within the stone, as in cat’s eye chrysoberyl.

One Comment to “Chatoyancy”

  1. also see asterism.

    other cool things gems do– some also color change due to type of lighting used ie fluorescent/ incandescent– can’t remember the name for it

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