What does chatoyance mean?
Chatoyance is the optical effect, prized in gemmology, in which a narrow band of light appears to glide across the surface of a stone as it is turned, much like the gleam in a cat's eye. It arises in minerals whose parallel fibres or needle-like inclusions reflect light along a single line, and it gives tiger's-eye, chrysoberyl 'cat's-eye', and certain quartzes their distinctive silky glow. Stones displaying this property are said to be chatoyant. Beyond the jeweller's bench, the word has found a wider figurative life, applied by writers to water, silk, or any surface whose light seems to shift and shimmer as one moves. Formal in register and rich in connotation, chatoyance lends descriptive prose an air of precision and elegance. It derives from the French verb chatoyer, 'to shine like a cat's eye', itself rooted in chat, 'cat' — a reminder that some of our most refined aesthetic vocabulary begins with something as familiar as a household animal.
nounThe visual effect of a band of light that appears to glide across the surface of certain gemstones and materials as they are turned, resembling the slit eye of a cat; a shimmering, changeable lustre.
- The optical phenomenon in which a luminous band appears to move beneath the surface of certain minerals (such as chrysoberyl or tiger's-eye) as they are rotated, also called the cat's-eye effect.
- By extension, any shimmering, wavering quality of surface light or colour.
"The chrysoberyl's chatoyance shifted like a living gleam as she tilted it toward the lamp."
"Held to the sunlight, the tiger's-eye revealed a golden chatoyance that seemed to ripple across its polished face."
"The novelist described the sea at dusk as having a soft chatoyance, its surface glinting and dimming with every swell."
Rarely pluralized; the uncountable singular is standard even when referring to multiple stones.
"Different cuts brought out different chatoyances in the collection."
Named after a cat's eye: when jewellers say a stone has chatoyance, they literally mean it flashes at you like a feline slinking through candlelight.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of chatoyance
Chatoyance comes from the French chatoyer, meaning 'to shine like a cat's eye', formed from chat ('cat'), which descends from the Late Latin cattus. The term entered English in the nineteenth century as part of the vocabulary of gemmology, alongside the related adjective chatoyant. Its closest relatives in modern English are the adjective chatoyant and, more distantly, other words tracing back through Old North French forms involving cats.
Related word forms
How chatoyance is actually used
A technical term of mineralogy and gemmology that has drifted into literary and descriptive prose for any shifting, silky play of light. It is formal rather than colloquial, and usually carries a connotation of luxury, polish, or natural beauty.
Easily confused with chatoyance
Iridescence is a rainbow-like play of colours caused by interference of light, whereas chatoyance is a single moving band of light on the surface of stones such as tiger's-eye.