Construct · 1 fields · 2 citations

chatoyancy: a standalone construct

One name. One construct. A landmark on the map.

● anchor · one construct, one field Nearest construct by meaning·not indexed
chatoyancy1 CONSTRUCTChatoyancyCAT'S-EYE · FIBRES

A single standalone construct; nearby constructs are located against it in the Collider. Tap a field for its definition, unit, and measures.

Gemology

A band of light that slides across a stone

Chatoyancy is the cat's-eye effect: a single bright band of light that floats across the dome of a cabochon-cut stone and shifts as the stone is turned, caused by reflection from a dense set of parallel fibres, needle-like inclusions, or hollow tubes all oriented in one direction. Read's Gemmology and Webster's Gems describe it in chrysoberyl cat's-eye, tiger's-eye, and other fibrous stones, noting that the sharpest eyes come from the finest, most parallel inclusions cut with the band across the fibres. The construct is an optical reflection figure named for the slit-like eye of a cat, and the crispness and brightness of the band set a cat's-eye stone's value.[1][2]

Unit
The sharpness, brightness, and mobility of the single reflected band
Recovery means
Not applicable
Measured by
Judged by the crispness, centring, and movement of the light band under a single light source

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Nearby constructs

asterism1 fields · 2 citationsanchor · a standalone constructplay-of-color1 fields · 2 citationsanchor · one construct, one fieldband2 fields · 2 citationsjingle · one word, two constructs

References

  1. Read, P. G. (2005). Gemmology (3rd ed.). Elsevier Butterworth-Heinemann. ISBN 9780750664493
  2. Webster, R. (1994). Gems: Their sources, descriptions and identification (5th ed.). Butterworth-Heinemann. ISBN 9780750616744

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