Construct · 1 fields · 2 citations

asterism: a standalone construct

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

● anchor · a standalone construct Nearest construct by meaning·not indexed
asterism1 CONSTRUCTStar-stone asterismSTAR · SAPPHIRE

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

Gemology

A star of light in a cabochon

In gemology, asterism is the star-shaped figure of light seen on a domed (cabochon) stone such as a star sapphire or star ruby: fine needle-like inclusions aligned along the crystal's symmetry directions each reflect a band of light, and the bands cross to form a four- or six-rayed star that moves as the stone is turned. Webster's Gems and Read's Gemmology describe how the number and sharpness of rays follow the host crystal's symmetry and the orientation of its inclusions. The referent is an optical reflection figure inside a stone, unrelated to a pattern of stars in the sky or a typographic symbol beyond the shared image of a star.[1][2]

Unit
The number, orientation, and sharpness of the rays of the reflected star
Recovery means
Not applicable
Measured by
Assessed by the ray count and sharpness under a single light, tied to the alignment and density of the inclusions

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Nearby constructs

chatoyancy1 fields · 2 citationsanchor · one construct, one fieldarrangement3 fields · 6 citationsjingle · one word, three constructsband2 fields · 2 citationsjingle · one word, two constructs

References

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

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