GIA COLORED STONE ESSENTIALS QUESTIONS AND CORRECT SOLUTIONS
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GIA Colored Stones
Institution
GIA Colored Stones
GIA COLORED STONE ESSENTIALS QUESTIONS AND CORRECT SOLUTIONS
COLORED STONE Any gem material other than diamond.
GEMOLOGY The study of gems.
ORGANIC Once living, or produced by a living organism (plant or animal).
MINERALS A natural, inorganic substance with a characteristic chemical composition...
GIA COLORED STONE ESSENTIALS QUESTIONS AND CORRECT SOLUTIONS
COLORED STONE Any gem material other than diamond.
GEMOLOGY The study of gems.
ORGANIC Once living, or produced by a living organism (plant or animal).
MINERALS A natural, inorganic substance with a characteristic chemical composition and usually
characteristic structure.
INORGANIC Composed of, or arising from, non-living matter.
CHEMICAL COMPOSITIONS Kinds and relative quantities of atoms that make up a material.
DURABILITY A gemstone's ability to withstand wear, heat, and chemicals.
LUSTER The appearance of a material's surface in reflected light.
TRANSPARENCY Degree to which a material allows light to pass through it.
HARDNESS How well a gemstone resists scratches and abrasion.
TOUGHNESS How well a gemstone resists breaking, chipping, and cracking.
STABILITY How well a gemstone resists the effects of light, heat, and chemicals.
CRYSTAL STRUCTURE Regular, repeating internal arrangement of atoms in a material.
, GIA COLORED STONE ESSENTIALS QUESTIONS AND CORRECT SOLUTIONS
CHEMICAL FORMULA Written description of a material's chemical makeup.
TRACE ELEMENTS Atoms in a gem that aren't part of its essential chemical composition.
AMORPHOUS Lacking a regular crystal structure.
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.
GROUPS A family of gems from several closely related mineral species.
NATURAL GEMS Gems produced by natural processes, without human help.
LAB-GROWN GEM A manmade (synthetic) gem with essentially the same chemical composition,
crystal structure, and properties as its natural counterpart.
FEDERAL TRADE COMMISSION A US government agency that issues guidelines for the jewelry
trade.
SELECTIVE ABSORPTION Process by which a material absorbs some components of visible light
and returns others.
HUE The first impression of an object's basic color.
TONE Degree of darkness or lightness of a color.
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