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GIA Colored Stones Complete Final Exam 2024-2025

GIA Colored Stones Complete Final Exam 2024-2025
Window - ANS-An area of weak saturation in a transparent
gemstone's bodycolor that usually results from the way the gem was
cut.
Xenocryst - ANS-A "foreign crystal" that formed in unrelated rock
and was brought to the surface as a passenger in magma.
A gem produced by, or derived from, a living organism is - ANSorganic
Which of the following is an organic gem ? - ANS-Amber
A substance that consists of atoms of only one kind is a - ANSChemical Element
A natural, inorganic substance with a characteristic chemical
composition and usually characteristic structure is a(n) - ANSmineral
Most gems are - ANS-Minerals
A natural material that's made up of a mass of one or more kinds of
mineral crystals is a - ANS-Rock
Which of the following is amorphous ? - ANS-Amber
A broad gem category based on chemical composition and crystal
structure is a - ANS-Group
Which of the following is a gem variety ? - ANS-Andradite
Which group does almandine belong to ? - ANS-Garnet
The world's largest gem-consuming market is - ANS-United States
Synthetic gem materials - ANS-are not minerals.
To be a gem, a mineral must be beautiful, durable, and - ANS-Rare.
Mineral - ANS-A natural, inorganic substance with a characteristic
chemical composition and usually characteristic structure.
Mixed cut - ANS-A cutting style that combines brilliant-cut and step
cut facets.
Abrasions - ANS-Tiny nicks and pits caused by wear and damage to
a gem's facet edges or culet.
Absorption spectrum - ANS-A pattern of dark vertical lines or bands
shown by certain gems when viewed through a spectroscope.
Adularescence - ANS-The cloudy bluish white light in a moonstone,
caused by scattering of light.
Agate - ANS-Chalcedony with a curved or angular bands or layers
that differ in color and transparency .
Aggregate - ANS-A mass of tiny, randomly oriented crystals.
Akoya - ANS-Common name for the Pinctada fucata oyster and the
natural or cultured pearls it produces.
Allochromatic - ANS-A gem colored by trace elements in its crystal
structure.
Alluvial deposit - ANS-A deposit where gems are eroded from their
source rock, then transported away from their source and further
concentrated.
Amorphous - ANS-Lacking a regular crystal structure.
Aragonite - ANS-A crystalized form of calcium carbonate found in
nacre.
Assembled stone - ANS-Two or more separate pieces of material
joined to form a unit.