Examples of the major special optical effects to be found in precious stones.
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- Asterism in CorundumThat is, star sapphire
- Chatoyancy in QuartzA fibrous eye
- Fire in DiamondA rare quality
- Fluorescence in FluoriteTypical purple
- Iridescence in SeashellGemstones underfoot
- Labradorescence in LabradoriteUnique to this mineral
- Opalescence in OpalSubtle iridescence
- Schiller in OpalOr play of color
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- Text Index