Liddicoat, Richard T., Jr. Gemological Institute of America, Los Angeles, California.
Last reviewed:May 2021
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- Natural gems
- Precious and semiprecious stones
- Gem materials
- Manufactured gems
- Treated gems
- Synthetic gems
- Imitation gems
- Identification of substitutes
- Gem cutting
- Gem mounting
- Related Primary Literature
- Additional Reading
A mineral or other material that has sufficient beauty for use as personal adornment and has the durability to make this feasible. With the exception of a few materials of organic origin, such as pearl, amber, coral, and jet, and inorganic substances of variable composition, such as natural glass, gems are lovely varieties of minerals (Fig. 1). See also: Jet (gemology)
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