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GIA Colored Stone Final Exam Questions
with Detailed Verified Answers
By what date had Kokichi Mikimoto begun culturing whole pearls Ans:
1908
Synthetic gem materials Ans: Are not minerals
which of the following is an organic gem Ans: amber
which of the following is amorphous Ans: amber
a natural material that's made up of a mass of one or more kinds of
mineral crystals is Ans: rock
what group does alamandine belong to Ans: garnet
A gem produced by, or derived from, a living organism is Ans: organic
which of the following is a gem variety Ans: demantoid
the world's largest gem-consuming market is Ans: the US
a substance that consists of atoms of only one kind is a Ans: chemical
element
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Media attention in the 1990s regarding its treatment reduced consumer
confidence in Ans: emerald
a natural, inorganic substance with a characteristic chemical composition
and usual crystal structure is a Ans: mineral
most gems are Ans: minerals
To be a gem, a mineral must be beautiful, durable, and Ans: rare
a broad gem category based on chemical composition and crystal
structure is called a Ans: gem species
Many colored stones are mined by Ans: independent miners using
small-scale mining methods.
Rocks altered by heat and pressure beneath Earth's surface are Ans:
metamorphic
Which type of deposit is usually the most profitable for colored stone
mining? Ans: secondary
Which gem can crystallize in volcanic rock from gasses released by
magma? Ans: red beryl
Emeralds are rarely found in placer deposits because they're Ans:
unable to withstand much abrasion
Which is a workable alluvial deposit of gem minerals with economic
potential? Ans: placers
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Which is a deposit where gems eroded from the source rock and
remained in place nearby? Ans: eluvial
from granite, pegmatite gems get exotic elements like Ans: beryllium,
boron, and lithium
Myanmar's famous Mogok ruby deposits were formed by Ans:
metamorphic process
most of the gems in tanzania's umba river valley are formed in Ans:
placer deposits
A deposit where gems are found in the rock that where they formed is
called Ans: primary deposit
Which is a key locality for hydrothermal gems? Ans: Ouro Preto, Brazil
Heat and pressure transform limestone into Ans: marble
which gem form by metamophosis Ans: tanzanite
Most gemstones form in the Ans: continental crust
kunzite is most often associated with Ans: tourmaline and beryl in
pegmatites
how heavy an object is in relation to its size Ans: density
A two-phase inclusion is a cavity in a gem that's typically filled with a
Ans: liquid and a gas
which type of twinning is caused by environmental change after a gem
forms Ans: polysynthetic
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which element caused red in ruby and green in emerald Ans: chromium
A unit cell defines a mineral's Ans: basic identity
which type of twinning looks as if two crystal halves are mirror images
Ans: contact twinning
crystals that grow in a flux that is highly saturated with the necessary
elements tend to be - Ans: small
which is classified in the orthorhombic crystal system Ans: topaz
Which gems are cryptocrystalline aggregates? Ans: Chalcedony and
turquoise
Atoms in a gem that aren't part of its essential chemical composition are
called Ans: trace elements
Many fashioned rubies have shallow proportions because they're cut from
Ans: flattened crystals
Rough spinel often occurs as Ans: twinned crystals
Needles of actinolite found in emerald are classified as Ans: inclusions
which aggregates crystals are visible only under very high magnification
Ans: cryptocrystalline
the trace elements that cause corundum's blue are Ans: iron and
titanium
what element does chromium substitute for to cause ruby's red Ans:
aluminium
GIA Colored Stone Final Exam Questions
with Detailed Verified Answers
By what date had Kokichi Mikimoto begun culturing whole pearls Ans:
1908
Synthetic gem materials Ans: Are not minerals
which of the following is an organic gem Ans: amber
which of the following is amorphous Ans: amber
a natural material that's made up of a mass of one or more kinds of
mineral crystals is Ans: rock
what group does alamandine belong to Ans: garnet
A gem produced by, or derived from, a living organism is Ans: organic
which of the following is a gem variety Ans: demantoid
the world's largest gem-consuming market is Ans: the US
a substance that consists of atoms of only one kind is a Ans: chemical
element
, Page | 2
Media attention in the 1990s regarding its treatment reduced consumer
confidence in Ans: emerald
a natural, inorganic substance with a characteristic chemical composition
and usual crystal structure is a Ans: mineral
most gems are Ans: minerals
To be a gem, a mineral must be beautiful, durable, and Ans: rare
a broad gem category based on chemical composition and crystal
structure is called a Ans: gem species
Many colored stones are mined by Ans: independent miners using
small-scale mining methods.
Rocks altered by heat and pressure beneath Earth's surface are Ans:
metamorphic
Which type of deposit is usually the most profitable for colored stone
mining? Ans: secondary
Which gem can crystallize in volcanic rock from gasses released by
magma? Ans: red beryl
Emeralds are rarely found in placer deposits because they're Ans:
unable to withstand much abrasion
Which is a workable alluvial deposit of gem minerals with economic
potential? Ans: placers
, Page | 3
Which is a deposit where gems eroded from the source rock and
remained in place nearby? Ans: eluvial
from granite, pegmatite gems get exotic elements like Ans: beryllium,
boron, and lithium
Myanmar's famous Mogok ruby deposits were formed by Ans:
metamorphic process
most of the gems in tanzania's umba river valley are formed in Ans:
placer deposits
A deposit where gems are found in the rock that where they formed is
called Ans: primary deposit
Which is a key locality for hydrothermal gems? Ans: Ouro Preto, Brazil
Heat and pressure transform limestone into Ans: marble
which gem form by metamophosis Ans: tanzanite
Most gemstones form in the Ans: continental crust
kunzite is most often associated with Ans: tourmaline and beryl in
pegmatites
how heavy an object is in relation to its size Ans: density
A two-phase inclusion is a cavity in a gem that's typically filled with a
Ans: liquid and a gas
which type of twinning is caused by environmental change after a gem
forms Ans: polysynthetic
, Page | 4
which element caused red in ruby and green in emerald Ans: chromium
A unit cell defines a mineral's Ans: basic identity
which type of twinning looks as if two crystal halves are mirror images
Ans: contact twinning
crystals that grow in a flux that is highly saturated with the necessary
elements tend to be - Ans: small
which is classified in the orthorhombic crystal system Ans: topaz
Which gems are cryptocrystalline aggregates? Ans: Chalcedony and
turquoise
Atoms in a gem that aren't part of its essential chemical composition are
called Ans: trace elements
Many fashioned rubies have shallow proportions because they're cut from
Ans: flattened crystals
Rough spinel often occurs as Ans: twinned crystals
Needles of actinolite found in emerald are classified as Ans: inclusions
which aggregates crystals are visible only under very high magnification
Ans: cryptocrystalline
the trace elements that cause corundum's blue are Ans: iron and
titanium
what element does chromium substitute for to cause ruby's red Ans:
aluminium
