source
A gem-producing country or area, or a particular mine in that area.
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inorganic
Composed of, or arising from, non-living matter.
organic
Produced by, or derived from, a living organism.
natural gems
Gems produced by natural processes, without human help.
atoms
The basic structural unit of all matter.
chemical element
A substance that consists of atoms of only one kind.
chemical composition
Kinds and relative quantities of atoms that make up a material.
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facets
A flat, polished surface on a finished gem.
minerals
A natural, inorganic substance with a characteristic chemical composition and usually
characteristic structure.
rocks
A natural material composed of masses of mineral crystals of one or more kinds.
silicates
A mineral that contains the elements silicon and oxygen.
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crystal structure
Regular, repeating internal arrangement of atoms in a material.
amorphous
Lacking a regular crystal structure.
gem species
A broad gem category based on chemical composition and crystal structure.
variety
A subcategory of species, based on color, transparency, or phenomenon.
phenomenon
An unusual optical effect displayed by a gem.
group
A family of gems from several closely related mineral species.
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disclosure
Clearly and accurately informing customers about the nature of the goods they buy.
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