GIA Colored Stone Final Exam| 394 Questions and Answers 100% Correct!
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GIA Colored Stone
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GIA Colored Stone
By what date had Kokichi Mikimoto begun culturing whole pearls - ANSWER - 1908
Synthetic gem materials - ANSWER - Are not minerals
which of the following is an organic gem - ANSWER - amber
which of the following is amorphous - ANSWER - amber
a natural material that's made up of a mass o...
GIA Colored Stone Final Exam|
394 Questions and Answers
100% Correct!
By what date had Kokichi Mikimoto begun culturing whole pearls - ANSWER - 1908
Synthetic gem materials - ANSWER - Are not minerals
which of the following is an organic gem - ANSWER - amber
which of the following is amorphous - ANSWER - amber
a natural material that's made up of a mass of one or more kinds of mineral crystals
is - ANSWER - rock
what group does alamandine belong to - ANSWER - garnet
a broad gem category based on chemical composition and crystal structure is called
a - ANSWER - gem species
Many colored stones are mined by - ANSWER - independent miners using small-
scale mining methods.
Rocks altered by heat and pressure beneath Earth's surface are - ANSWER -
metamorphic
A gem produced by, or derived from, a living organism is - ANSWER - organic
which of the following is a gem variety - ANSWER - demantoid
,the world's largest gem-consuming market is - ANSWER - the US
a substance that consists of atoms of only one kind is a - ANSWER - chemical
element
Which is a workable alluvial deposit of gem minerals with economic potential? -
ANSWER - placers
Which is a deposit where gems eroded from the source rock and remained in place
nearby? - ANSWER - eluvial
from granite, pegmatite gems get exotic elements like - ANSWER - beryllium, boron,
and lithium
When a gem's crystal structure splits light into two rays that each travel at a slightly
different speed and direction, it's called - ANSWER - double refraction
what is the only type of gem that can show pleochroism - ANSWER - doubly
refractive gems
which transition element causes a greater variety of gem colors that any other -
ANSWER - iron
Myanmar's famous Mogok ruby deposits were formed by - ANSWER - metamorphic
process
most of the gems in tanzania's umba river valley are formed in - ANSWER - placer
deposits
A deposit where gems are found in the rock that where they formed is called -
ANSWER - primary deposit
,Which is a key locality for hydrothermal gems? - ANSWER - Ouro Preto, Brazil
Heat and pressure transform limestone into - ANSWER - marble
which gem form by metamophosis - ANSWER - tanzanite
Most gemstones form in the - ANSWER - continental crust
kunzite is most often associated with - ANSWER - tourmaline and beryl in
pegmatites
how heavy an object is in relation to its size - ANSWER - density
A two-phase inclusion is a cavity in a gem that's typically filled with a - ANSWER -
liquid and a gas
Media attention in the 1990s regarding its treatment reduced consumer confidence
in - ANSWER - emerald
a natural, inorganic substance with a characteristic chemical composition and usual
crystal structure is a - ANSWER - mineral
most gems are - ANSWER - minerals
To be a gem, a mineral must be beautiful, durable, and - ANSWER - rare
Which type of deposit is usually the most profitable for colored stone mining? -
ANSWER - secondary
, Which gem can crystallize in volcanic rock from gasses released by magma? -
ANSWER - red beryl
Emeralds are rarely found in placer deposits because they're - ANSWER - unable to
withstand much abrasion
which type of twinning is caused by environmental change after a gem forms -
ANSWER - polysynthetic
which element caused red in ruby and green in emerald - ANSWER - chromium
Many fashioned rubies have shallow proportions because they're cut from - ANSWER
- flattened crystals
Rough spinel often occurs as - ANSWER - twinned crystals
Needles of actinolite found in emerald are classified as - ANSWER - inclusions
which aggregates crystals are visible only under very high magnification - ANSWER -
cryptocrystalline
the trace elements that cause corundum's blue are - ANSWER - iron and titanium
what element does chromium substitute for to cause ruby's red - ANSWER -
aluminium
In many blue sapphires, the intervalence charge transfer that causes the color is
between - ANSWER - iron and titanium
The pattern of dark vertical lines or bands shown by certain gems when viewed
through a spectroscope is called - ANSWER - absorption spectrum
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