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An asterism (from Ancient Greek ἀστήρ (astḗr) 'star' and -ism) is a star-shaped concentration of light reflected or refracted from a gemstone. It can appear when a suitable stone is cut en cabochon (i.e. shaped and polished, not faceted).
Description, Archetype & Overview
Explore the main themes, entities and connections around Asterism (gemology). Start with the topic map, then use the sections below for research and deeper semantic analysis.
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star rutile stone light also asterism sapphire gemstone inclusions asteria impurities sapphires hematite cabochon rays within caused suitable cut exhibits
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| corundum | instance of | Rutile causes the relative bright relief of a star in a host material | 0.80 | text |
| which has a refractive index between 1.760 | instance of | Rutile causes the relative bright relief of a star in a host material | 0.80 | text |
| 1.778 | instance of | Rutile causes the relative bright relief of a star in a host material | 0.80 | text |
| much lower than that of rutile | instance of | Rutile causes the relative bright relief of a star in a host material | 0.80 | text |
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