GIA Colored Stones Exam Questions and Answers 100% Verified!
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GIA Colored Stones
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GIA Colored Stones
Mineral - ANSWER - A natural, inorganic substance with a characteristic chemical composition and usually characteristic structure.
Mixed cut - ANSWER - A cutting style that combines brilliant-cut and step cut facets.
Abrasions - ANSWER - Tiny nicks and pits caused by wear and damage to a gem'...
GIA Colored Stones Exam
Questions and Answers 100%
Verified!
Mineral - ANSWER - A natural, inorganic substance with a characteristic chemical
composition and usually characteristic structure.
Mixed cut - ANSWER - A cutting style that combines brilliant-cut and step cut facets.
Abrasions - ANSWER - Tiny nicks and pits caused by wear and damage to a gem's
facet edges or culet.
Absorption spectrum - ANSWER - A pattern of dark vertical lines or bands shown by
certain gems when viewed through a spectroscope.
Adularescence - ANSWER - The cloudy bluish white light in a moonstone, caused by
scattering of light.
Agate - ANSWER - Chalcedony with a curved or angular bands or layers that differ in
color and transparency .
Aggregate - ANSWER - A mass of tiny, randomly oriented crystals.
Akoya - ANSWER - Common name for the Pinctada fucata oyster and the natural or
cultured pearls it produces.
Blemish - ANSWER - Characteristic or irregularity confined to the surface of a
polished gemstone.
Blue Sheen - ANSWER - Trade term for a highly prized, vivid blue adularescence
displayed by the finest moonstone.
,Bodycolor - ANSWER - A gemstone's basic color, determined by its selective
absorption of light.
Allochromatic - ANSWER - A gem colored by trace elements in its crystal structure.
Bleaching - ANSWER - A treatment that uses chemicals to lighten or remove color.
Botryoidal - ANSWER - A crystal growth habit with a bumpy appearance similar to a
bunch of grapes.
Boulder opal - ANSWER - Thin layers of precious opal, cut to include matrix.
Boule - ANSWER - A cylindrical synthetic crystal produced by the flame-fusion
process.
Brilliance - ANSWER - Light that eventually returns to the eye after entering a gem
through the crown, reflecting off its pavilion facets, and exiting back through the
crown.
Brilliant cut - ANSWER - Cutting style with triangular or kite-shaped facets that
radiate from the center toward girdle.
Cabochon - ANSWER - A smoothly rounded polished gem with a domed top and a
flat or curved base.
Calcareous concretion - ANSWER - A non-nacreous natural "pearl".
Calibrated sizes - ANSWER - Gemstone sizes cut to fit standard mountings.
Cameo - ANSWER - A gem carving style in which the design often a women's profile,
projects slightly from a flat or curved surface.
,Cavity - ANSWER - An opening that extends into a gem from the surface.
Centipedes - ANSWER - Tiny tension cracks in a moonstone that interfere with
adularescence and reduce value.
Alluvial deposit - ANSWER - A deposit where gems are eroded from their source
rock, then transported away from their source and further concentrated.
Amorphous - ANSWER - Lacking a regular crystal structure.
Aragonite - ANSWER - A crystalized form of calcium carbonate found in nacre.
Assembled stone - ANSWER - Two or more separate pieces of material joined to form
a unit.
Asterism - ANSWER - Crossing of chatoyant bands, creating a star in the dome of
cabochon.
Atom - ANSWER - The basic structural unit of all matter.
Aventurescence - ANSWER - A glittery effect caused by light reflecting from small,
flat inclusions within a gemstone.
Background color - ANSWER - An opal's bodycolor, independent of its play-of-color.
Bead nucleus - ANSWER - A bead used as the core of a cultured pearl, usually made
from a freshwater mussel shell.
Crystal structure - ANSWER - Regular, repeating internal arrangement of atoms in a
material.
Cultured blister pearl - ANSWER - A cultured pearl grown around a nucleus glued
under the mantle tissue inside a mollusk's shell.
, Cultured pearl - ANSWER - A pearl formed as the result of human intervention in the
formation process.
Chemical element - ANSWER - A substance that consists of atoms of only one kind.
Chip - ANSWER - A damaged area on a gem, usually near the girdle.
Chrome tourmaline - ANSWER - Trade term for a vibrant green tourmaline that's
colored by traces of vanadium, chromium, or both.
Circled pearl - ANSWER - A pearl with one or more grooved or ridged rings all the
way around it.
Cleavage - ANSWER - A smooth, flat break in a gemstone parallel to planes of
atomic weakness, caused by weak or fewer bonds between atoms or both.
Cloud - ANSWER - Any hazy or milky area that cannot be described as a feather,
fingerprint, or group of included crystals or needles.
Cobbing - ANSWER - Removing heavily included sections from a gemstone rough by
carefully tapping it with a small hammer.
Color center - ANSWER - A small defect in the atomic structure of a material that
absorb light and give rise to a color.
Color Change - ANSWER - A distinct change in gem color under different types of
lighting.
Color range - ANSWER - The selection of colors in which a gemstone occurs.
Color zoning - ANSWER - Areas of different color in a gem, caused by variations in
growth conditions.
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