Exam (elaborations)
GIA Colored Stone Final Exam (1)
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- MSF Basic Rider Course Test
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- MSF Basic Rider Course Test
GIA Colored Stone Final Exam (1)
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GIA Colored Stone Final Exam"Maraba" amethyst is often - ANS-uniform in color
a broad gem category based on chemical composition and crystal structure is called a -
ANS-gem species
A carved design that projects slightly from a flat or curved surface is a(n) - ANS-cameo
A characteristic or irregularity confined to the surface of a polished gemstone is a -
ANS-blemish
A city, region, or country with a large number of gemstone manufacturers is called -
ANS-a cutting center
A deposit where gems are found in the rock that where they formed is called -
ANS-primary deposit
a gem colored by an element that is part of it's basic chemistry is called -
ANS-idiochromatic
A gem produced by, or derived from, a living organism is - ANS-organic
A gem's origin refers to - ANS-the geographical place where it was mined
A gem's price divided by its carat weight is called - ANS-per-carat 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 - ANS-synthetic
A major source of black star sapphire is - ANS-Thailand
A metric carat equals - ANS-0.20 gram.
a natural material that's made up of a mass of one or more kinds of mineral crystals is -
ANS-rock
,a natural, inorganic substance with a characteristic chemical composition and usual
crystal structure is a - ANS-mineral
A procedure that includes cleaning, buffing, and sometimes bleaching, done to make
cultured pearls presentable and appealing is called - ANS-a process
A quantity of stones of similar or mixed qualities, from a single mine or from various
sources, offered for sale together is called a - ANS-a parcel
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 treatment that makes turquoise less porous without the use of polymers and improves
its ability to take a good polish is - ANS-the Zachery method
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
About half of all the jewelry sold in the world is sold in - ANS-the US
Adularescence is caused by - ANS-scattering of light
After irradiation, which gem's color is stable under normal wearing conditions -
ANS-golden beryl
Alexandrite was discovered in - ANS-1830
All garnets have essentially the same - ANS-crystal structure
Almost all tanzanite is - ANS-heat treated
Amber is actually - ANS-hardened tree resin
An angular, hollow space that resembles a mineral inclusion is called a - ANS-negative
crystals
, 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
Aragonite is a crystallize form on - ANS-calcium carbonate
Asterism in black star sapphire is cause by - ANS-hematite
At most pearl farms, post-harvest procedures consist of washing and - ANS-polishing
Atoms in a gem that aren't part of its essential chemical composition are called -
ANS-trace elements
Australian sapphire's blue color is often described as - ANS-inky
Before looking at the color of the gem, clean the stone, and then pick it up by its girdle
with tweezers or place it on a background that is - ANS-neutrally colored
Between 1992 and 2006, oysters in many important Japanese cultured pearl farming
areas began to - ANS-die off in massive numbers
Blue sapphire's most common crystal habit is a(n) - ANS-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
Both tiger's-eye and hawk's-eye quartz are - ANS-microcyrstalline aggregates
Boulder opal consists of thin layers of precious opal cut to include a matrix of sandstone
or - ANS-ironstone
Brazilian emeralds are mines from - ANS-areas where pegmatites intersect with schists
By some estimates, Thailand controlled what percentage of the global ruby and
sapphire trade in the 1970's and 1980's - ANS-80%
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