COLORED STONES ESSENTIALS
Most gems are ____ - answer--Minerals
All ____ possess some degree of beauty, rarity and durability - answer--Gems
____ is the most important factor in colored stone's beauty - answer--Color
Most gems are somewhere in the middle of the ____ scale - answer--Rarity
Lacking a regular crystal structure - answer--Amorphous
Kinds and relative quantities of atoms that make up a material - answer--Chemical
composition
Written description of a material's chemical make-up - answer--Chemical formula
Any gem material other than diamond - answer--Colored stone
Regular, repeating internal arrangement of atoms in a material - answer--Crystal
structure
A gemstone's ability to withstand wear, heat and chemicals - answer--Durability
A US Government agency that issued guidelines for the jewelry trade - answer--
Federal Trade Commission
A broad gem category based on chemical composition and crystal structure -
answer--Gem species
A subcategory of species, based on color, transparency or phenomenon - answer--
Gem variety
A family of gems from several closely related mineral species - answer--Group
How well a gemstone resists scratches and abrasion - answer--Hardness
The appearance of a material's surface in reflected light - answer--Luster
A natural, inorganic substance with a characteristic chemical composition and
usually characteristic structure - answer--Mineral
Gems produced by natural processes, without human help - answer--Natural gems
How well a gemstone resists the effect of light, heat, and chemicals - answer--
Stability
, How well a gemstone resists breaking, chipping and cracking - answer--Toughness
Degree to which a material allows light to pass through it - answer--Transparency
____ requires the interaction of light, an object and an observer - answer--Color
A gem's chemical composition and crystal structure affect the way it ________ light -
answer--Absorbs and returns
Each gem species or variety has its own ________ and its own best color within that
range - answer--Color range
In some gem varieties, slight variations in hue, tone and saturation can make a ____
difference in price - answer--Tremendous
The cloudy bluish white light in a moonstone, caused by scattering light - answer--
Adularescence
Crossing of chatoyant bands, creating a star in the dome of a cabochon - answer--
Asterism
A glittery effect caused by light reflecting from small, flat inclusions within a
gemstone - answer--Adventurescence
A gemstone's basic color, determined by its selective absorption of light - answer--
Bodycolor
Bands of light in certain gems, caused by reflection of light from many parallel,
needle-like inclusions or hollow tubes - answer--Chatoyancy
A small defect in the atomic structure of a material that can absorb light and give rise
to a color - answer--Color center
A distinct change in gem color under different types of lighting - answer--Color
change
The selection of colors in which a gemstone occurs - answer--Color range
Areas of different color in gems, cussed by variations in growth conditions - answer--
Color zoning
The separation of white light into spectral colors - answer--Dispersion
Dark areas in a faceted transparent colored stone - answer--Extinction
The color or colors in a gemstone's color range considered by trade to be the most
desirable - answer--Fine color
The first impression of an object's basic color - answer--Hue
Most gems are ____ - answer--Minerals
All ____ possess some degree of beauty, rarity and durability - answer--Gems
____ is the most important factor in colored stone's beauty - answer--Color
Most gems are somewhere in the middle of the ____ scale - answer--Rarity
Lacking a regular crystal structure - answer--Amorphous
Kinds and relative quantities of atoms that make up a material - answer--Chemical
composition
Written description of a material's chemical make-up - answer--Chemical formula
Any gem material other than diamond - answer--Colored stone
Regular, repeating internal arrangement of atoms in a material - answer--Crystal
structure
A gemstone's ability to withstand wear, heat and chemicals - answer--Durability
A US Government agency that issued guidelines for the jewelry trade - answer--
Federal Trade Commission
A broad gem category based on chemical composition and crystal structure -
answer--Gem species
A subcategory of species, based on color, transparency or phenomenon - answer--
Gem variety
A family of gems from several closely related mineral species - answer--Group
How well a gemstone resists scratches and abrasion - answer--Hardness
The appearance of a material's surface in reflected light - answer--Luster
A natural, inorganic substance with a characteristic chemical composition and
usually characteristic structure - answer--Mineral
Gems produced by natural processes, without human help - answer--Natural gems
How well a gemstone resists the effect of light, heat, and chemicals - answer--
Stability
, How well a gemstone resists breaking, chipping and cracking - answer--Toughness
Degree to which a material allows light to pass through it - answer--Transparency
____ requires the interaction of light, an object and an observer - answer--Color
A gem's chemical composition and crystal structure affect the way it ________ light -
answer--Absorbs and returns
Each gem species or variety has its own ________ and its own best color within that
range - answer--Color range
In some gem varieties, slight variations in hue, tone and saturation can make a ____
difference in price - answer--Tremendous
The cloudy bluish white light in a moonstone, caused by scattering light - answer--
Adularescence
Crossing of chatoyant bands, creating a star in the dome of a cabochon - answer--
Asterism
A glittery effect caused by light reflecting from small, flat inclusions within a
gemstone - answer--Adventurescence
A gemstone's basic color, determined by its selective absorption of light - answer--
Bodycolor
Bands of light in certain gems, caused by reflection of light from many parallel,
needle-like inclusions or hollow tubes - answer--Chatoyancy
A small defect in the atomic structure of a material that can absorb light and give rise
to a color - answer--Color center
A distinct change in gem color under different types of lighting - answer--Color
change
The selection of colors in which a gemstone occurs - answer--Color range
Areas of different color in gems, cussed by variations in growth conditions - answer--
Color zoning
The separation of white light into spectral colors - answer--Dispersion
Dark areas in a faceted transparent colored stone - answer--Extinction
The color or colors in a gemstone's color range considered by trade to be the most
desirable - answer--Fine color
The first impression of an object's basic color - answer--Hue
