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GIA Colored Gemstones - Key Terms 2024 latest update with verified solutions
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GIA Colored Gemstones - Key Terms 2024 latest update with verified solutions
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GIA ColoredGemstones - Key
Terms 2024 latest
update with verified
solutions
Abrasions - answer Tiny nicks and pits caused by
wear and damage to a gem's facet edges or culet.
(Colored Stones: Assignment 10)
Absorption spectrum - answer A pattern of dark
vertical lines or bands shown by certain gems
when viewed through a spectroscope. (Colored
Stones: Assignment 4)
Adularescence - answer The cloudy bluish white
light in a moonstone, caused by scattering of light.
(Colored Stones: Assignment 4)
Agate - answer Chalcedony with curved or
angular bands or layers that differ in color and
transparency. (Colored Stones: Assignment 20)
,Aggregate - answer A mass of tiny, randomly
oriented crystals. (Colored Stones: Assignment 3)
Akoya - answer Common name for the Pinctada
fucata oyster and the natural or cultured pearls it
produces. (Colored Stones: Assignment 16)
Allochromatic - answer A gem colored by trace
elements in its crystal structure. (Colored Stones:
Assignment 4)
Alluvial deposit - answer A deposit where gems
are eroded from their source rock, then
transported away from the source and further
concentrated. (Colored Stones: Assignment 2)
Amorphous - answer Lacking a regular crystal
structure. (Colored Stones: Assignment 1)
Aragonite - answer A crystallized form of calcium
carbonate found in nacre. (Colored Stones:
Assignment 16)
Assembled stone - answer Two or more separate
pieces of material joined to form a unit. (Colored
Stones: Assignment 5)
,Asterism - answer Crossing of chatoyant bands,
creating a star in the dome of a cabochon. (Colored
Stones: Assignment 4)
Atom - answer The basic structural unit of all
matter. (Colored Stones: Assignment 1)
Aventurescence - answer A glittery effect caused
by light reflecting from small, flat inclusions within
a gemstone. (Colored Stones: Assignment 4)
Background color - answer An opal's bodycolor,
independent of its play-of-color. (Colored Stones:
Assignment 19)
Bead nucleus - answer A bead used as the core of
a cultured pearl, usually made from a freshwater
mussel shell. (Colored Stones: Assignment 16)
Bleaching - answer A treatment that uses
chemicals to lighten or remove color. (Colored
Stones: Assignment 6)
Blemish - answer Characteristic or irregularity
confined to the surface of a polished gemstone.
(Colored Stones: Assignment 10)
, Blue sheen - answer Trade term for a highly
prized, vivid blue adularescence displayed by the
finest moonstone. (Colored Stones: Assignment 26)
Bodycolor - answer A gemstone's basic color,
determined by its selective absorption of light.
(Colored Stones: Assignment 8)
Botryoidal - answer A crystal growth habit with a
bumpy appearance similar to a bunch of grapes.
(Colored Stones: Assignment 20)
Boulder opal - answer Thin layers of precious
opal, cut to include matrix. (Colored Stones:
Assignment 19)
Boule - answer A cylindrical synthetic crystal
produced by the flame-fusion process. (Colored
Stones: Assignment 5)
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. (Colored Stones: Assignment 9)
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