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GIA chapter 1
Terms in this set (49)
Diamond is composed primarily of
Compared to blemishes, inclusions normally have
more impact on a diamond's value
The three major parts of a polished diamond are crown, pavilion, and
The small, flat, polishes surfaces on a finished diamond are called
The flashes of color you see in polished diamond are called
A standard round brilliant- cut diamond has
57 or 58 facets
Gem shapes other than the standard round brilliant are called
On average, mine workers must process more than a ton of rock to recover
a half carat of diamond
The metric carat equals
The term brilliant cut is used for gemstones with facets that
are mostly triangular or kite- shaped.
Clarity characteristics confined to the surface of a polished diamond are called
The combination of the Four Cs relates primarily to
The term "point" in reference to weight is equal to
Most diamonds used in jewelry are
nearly colorless to very light yellow or light brown
A gemstone's resistance to scratching is known as its
A small, four-sided step cut that's rectangular, square, or tapered.
Clarity characteristic that's confined to the surface of a polished gemstone.
Cutting style that's developed, named, and promoted by a specific manufacturer.
The brightness created by the combination of all the white light reflections from the surface and the inside of a polished diamond.
Cutting style with triangular or kite- shaped facets that radiate from the center toward the girdle.
The collective term for inclusions and blemishes.
Top part of the gem above the girdle.
Small facet at the bottom of a finished gem.
A gemstone's ability to withstand wear, heat, and chemicals.
A flat, polished surface on a finished gem.
Any gemstone shape other than round.
The flashes of color you see in a polished diamond.
Value factors (clarity, color, cut, and carat weight)
Rough gem material that requires normal processing to produce a polished gem suitable for use in jewelry.
The narrow section of a finished gem that forms the boundary between the crown and the pavilion and functions as the gem's setting edge.
How well a gemstone resists scratches and abrasion.
Clarity characteristic totally enclosed in a polished gemstone or extending into it from the surface.
A unit of measure for the fineness of gold, abbreviated
The international unit of measurement for gem weight. One carat equals one- fifth of gram (0.200 g).
Cut that combines brilliant- cut and step-cut styles.
Ranking of the relative hardness of 10 minerals.
Rough gem material that requires substantially more processing than gem-quality rough to produce a polished gem suitable for use in jewelry.
Lower part of a faceted gem below the girdle.
One hundredth of a carat (0.01 ct.).
The flashes of light you see when the diamond, the light, or the observer moves.
A natural or manmade material that resembles a gem (also called imitation).
A round stone with 17 or 18 facets.
How well a diamond resists chemicals and temperature changes.
Standard round brilliant
A round brilliant- cut stone with 57 or 58 facets. Often called a full cut.
A cutting style that features long, narrow facets in row (usually three) parallel to the girdle on both the crown and pavilion.
A manmade gem with essentially the same chemical composition, crystal structure, and properties as a natural gem.
Damage caused by sudden, extreme temperature changes.
How well a gemstone resists breaking and chipping.
Features used to judge the quality and value of all gemstones.