Exam (elaborations)
GIA Colored Stones.
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Exam of 42 pages for the course Journalism 190 Test #2. at Journalism 190 Test #2. (GIA Colored Stones.)
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GIA Colored Stones"Maraba" amethyst is often - ANS-uniform in color.
"Paua" is a Maori name for - ANS-abalone shell.
A broad gem category based on chemical composition and crystal structure is a -
ANS-Group
A characteristic or irregularity confined to the surface of a polished gemstone is a(n) -
ANS-blemish.
A cutter can darken the color of a pale stone by cutting a - ANS-deep pavilion.
A deposit where gems are found in the rock that carried them to the earth's surface is
called - ANS-primary
A gem colored by an element that's part of its basic chemistry is called -
ANS-idiochromatic.
A gem produced by, or derived from, a living organism is - ANS-organic
A gem's price divided by its caret weight is called - ANS-per-caret price.
A general term for a break in a stone is - ANS-feather.
A laboratory-created gem with essentially the same chemical composition, crystal
structure, and properties as its natural counterpart is a(n) - ANS-synthetic
A major source of black star sapphire is - ANS-Australia.
A metric carat equals - ANS-0.20 grams.
A natural material that's made up of a mass of one or more kinds of mineral crystals is a
- ANS-Rock
A natural, inorganic substance with a characteristic chemical composition and usually
characteristic structure is a(n) - ANS-mineral
,A new turquoise treatment that appeared in the 1980s and has been used to treat more
than 10 million carats is - ANS-the Zachery method.
A numbers of similar cultured pearl strands bundled together is called a - ANS-hank.
A see-through area in a transparent gemstone's body color that usually results from the
way the gem was cut is called - ANS-a window.
A snakeskin structural pattern is typical of - ANS-synthetic opal.
A substance that consists of atoms of only one kind is a - ANS-Chemical Element
A two-phase inclusion is a cavity in a gem that's typically filled with a - ANS-liquid and a
gas
A unit cell defines a mineral's - ANS-basic identity.
A window usually differs from the rest of the stone in - ANS-saturation.
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.
Adularescence is caused by - ANS-scattering of light.
After irradiation, which gem's color is stable under normal wearing conditions ? -
ANS-Golden beryl
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.
,Alexandrite was discovered in - ANS-1830.
All garnets have essentially the same - ANS-crystal structure.
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.
Almost all akoya and Chinese freshwater pearls are - ANS-bleached.
Almost all tanzanite is - ANS-heat-treated.
Amber is actually - ANS-hardened tree resin.
Amorphous - ANS-Lacking a regular crystal structure.
An angular, hollow space that resembles a mineral inclusion is called a - ANS-negative
crystal.
An inclusion with the most negative impact on a colored stone's clarity would be located
- ANS-under the table.
An intense, unstable green color can be created in spodumene by - ANS-irradiation.
An object's weight in relation to its size is called its - ANS-density.
Aragonite - ANS-A crystalized form of calcium carbonate found in nacre.
Aragonite is a crystallized for of - ANS-calcium carbonate.
Assembled stone - ANS-Two or more separate pieces of material joined to form a unit.
Asterism - ANS-Crossing of chatoyant bands, creating a star in the dome of cabochon.
Asterism in star sapphire is caused by - ANS-hematite.
Atom - ANS-The basic structural unit of all matter.
, Atoms in a gem that are not part of its essential chemical composition are - ANS-trace
elements
Australian blue sapphire color is often described as - ANS-Inky.
Aventurescence - ANS-A glittery effect caused by light reflecting from small, flat
inclusions within a gemstone.
Background color - ANS-An opal's bodycolor, independent of its play-of-color.
Bead nucleus - ANS-A bead used as the core of a cultured pearl, usually made from a
freshwater mussel shell.
Bleaching - ANS-A treatment that uses chemicals to lighten or remove color.
Blemish - ANS-Characteristic or irregularity confined to the surface of a polished
gemstone.
Blue sapphire's most common crystal habit is - ANS-a spindle-shaped hexagonal
pyramid or bipyramid.
Blue sapphire's pleochroic colors are typically - ANS-slightly greenish blue and slightly
violetish blue.
Blue sapphires that originate in basaltic rock generally have - ANS-high iron content.
Blue Sheen - ANS-Trade term for a highly prized, vivid blue adularescence displayed by
the finest moonstone.
Bodycolor - ANS-A gemstone's basic color, determined by its selective absorption of
light.
Botryoidal - ANS-A crystal growth habit with a bumpy appearance similar to a bunch of
grapes.
Boulder opal - ANS-Thin layers of precious opal, cut to include matrix.
Boule - ANS-A cylindrical synthetic crystal produced by the flame-fusion process.
Brazilian emeralds are mined from - ANS-pegmatites, where they intersect with schists.
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