GIA Colored Stone Final Exam Questions and Answers 100% Solved
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GIA Colored Stone
Institution
GIA Colored Stone
GIA Colored Stone Final Exam
Questions and Answers 100% Solved
By what date had Kokichi Mikimoto begun culturing whole pearls -
1908
Synthetic gem materials - Are not minerals
which of the following is an organic gem - amber
which of the following is amorphous - amber
a natural material that...
By what date had Kokichi Mikimoto begun culturing whole pearls -
✔✔1908
Synthetic gem materials - ✔✔Are not minerals
which of the following is an organic gem - ✔✔amber
which of the following is amorphous - ✔✔amber
a natural material that's made up of a mass of one or more kinds of mineral
crystals is - ✔✔rock
what group does alamandine belong to - ✔✔garnet
A gem produced by, or derived from, a living organism is - ✔✔organic
which of the following is a gem variety - ✔✔demantoid
the world's largest gem-consuming market is - ✔✔the US
a substance that consists of atoms of only one kind is a - ✔✔chemical
element
,Media attention in the 1990s regarding its treatment reduced consumer
confidence in - ✔✔emerald
a natural, inorganic substance with a characteristic chemical composition
and usual crystal structure is a - ✔✔mineral
most gems are - ✔✔minerals
To be a gem, a mineral must be beautiful, durable, and - ✔✔rare
a broad gem category based on chemical composition and crystal structure
is called a - ✔✔gem species
Many colored stones are mined by - ✔✔independent miners using small-
scale mining methods.
Rocks altered by heat and pressure beneath Earth's surface are -
✔✔metamorphic
Which type of deposit is usually the most profitable for colored stone
mining? - ✔✔secondary
Which gem can crystallize in volcanic rock from gasses released by
magma? - ✔✔red beryl
Emeralds are rarely found in placer deposits because they're -
✔✔unable to withstand much abrasion
,Which is a workable alluvial deposit of gem minerals with economic
potential? - ✔✔placers
Which is a deposit where gems eroded from the source rock and remained
in place nearby? - ✔✔eluvial
from granite, pegmatite gems get exotic elements like - ✔✔beryllium,
boron, and lithium
Myanmar's famous Mogok ruby deposits were formed by -
✔✔metamorphic process
most of the gems in tanzania's umba river valley are formed in -
✔✔placer deposits
A deposit where gems are found in the rock that where they formed is
called - ✔✔primary deposit
Which is a key locality for hydrothermal gems? - ✔✔Ouro Preto, Brazil
Heat and pressure transform limestone into - ✔✔marble
which gem form by metamophosis - ✔✔tanzanite
Most gemstones form in the - ✔✔continental crust
kunzite is most often associated with - ✔✔tourmaline and beryl in
pegmatites
, how heavy an object is in relation to its size - ✔✔density
A two-phase inclusion is a cavity in a gem that's typically filled with a -
✔✔liquid and a gas
which type of twinning is caused by environmental change after a gem
forms - ✔✔polysynthetic
which element caused red in ruby and green in emerald - ✔✔chromium
A unit cell defines a mineral's - ✔✔basic identity
which type of twinning looks as if two crystal halves are mirror images -
✔✔contact twinning
crystals that grow in a flux that is highly saturated with the necessary
elements tend to be - - ✔✔small
which is classified in the orthorhombic crystal system - ✔✔topaz
Which gems are cryptocrystalline aggregates? - ✔✔Chalcedony and
turquoise
Atoms in a gem that aren't part of its essential chemical composition are
called - ✔✔trace elements
Many fashioned rubies have shallow proportions because they're cut from -
✔✔flattened crystals
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