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GIA Colored Stones Final Exam
Complete Test bank and Updated Study
Guide with Verified Answers
A gem produced by, or derived from, a living organism is ANSWER: Organic
Which of the following is an organic gem? ANSWER: Amber
A substance that consist of atoms of only one kind is a ANSWER: Chemical
element
A natural, in organic substance with a characteristic chemical composition and
usually characteristic crystal structure is a(n) ANSWER: Mineral
Most gems are ANSWER: Mineral
A natural material that's made up of a mass of one or more kind of mineral crystals
is a ANSWER: Rock
The broad gem categories based on chemical composition and crystal structure is a
ANSWER: Gem species
The worlds largest gem consuming market is ANSWER: The United states
Synthetic gem materials ANSWER: Are not minerals
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To be a gym, a mineral must be beautiful, durable, and ANSWER: Rare
Many colored stones are mined by ANSWER: Independent minors using small
scale mining methods
Media attention in the 1990s regarding its treatment reduced consumer confidence
in ANSWER: Emeralds
Most gemstones form in the ANSWER: continental crust
Rocks altered by heat and pressure are ANSWER: Metamorphic
Which gem can crystallize in volcanic rock from gas is released by magma?
ANSWER: Red beryl
Which is a key locality for hydrothermal gems ANSWER: Ouro Preto, Brazil
Heat and pressure transform lime stone into ANSWER: Marble
A deposit were gyms are found in the rocks where they formed is called
ANSWER: Primary
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Which type of deposit is usually the most profitable for colored stone mining
ANSWER: Secondary
Which is a deposit were gems eroded from the source rock and remain in place
nearby ANSWER: Eluvial
Kunzite is most often found in association with ANSWER: tourmaline and beryl
in pegmatite
Myanmar's famous mogok ruby deposits were formed by ANSWER: Metamorphic
process
From granite, pegmatite gyms get exotic elements like ANSWER: Beryllium,
boron, and lithium
Emeralds are rarely found in place or deposits because they are ANSWER: Unable
to withstand much abrasion
A unit cell defines a minerals ANSWER: Basic identity
Crystals that grow in a flux that is highly saturated with the necessary elements
tend to be ANSWER: Small
Which aggregate's crystals are visible only under high magnification ANSWER:
Cryptocrystalline
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Which is classified in the orthorhombic Crystal system ANSWER: Topaz
Which element causes red in Ruby and green emerald ANSWER: Chromium
Which type of twinning is caused by environmental change after the gem forms
ANSWER: Polysynthetic
Which type of twinning looks as if to crystals halves are mirror images ANSWER:
Contact
Needles of actinolite found in emerald are classified as ANSWER: Inclusions
Two phase inclusion are typically filled with ANSWER: A liquid and a gas
Atoms in a gem that are not part of its essential chemical composition are
ANSWER: Trace elements
The trace elements that Costco random's blue are ANSWER: Iron and titanium
How heavy an object is in relation to each size is its ANSWER: Density
Which gems are cryptocrystalline aggregates ANSWER: Chalcedony and
turquoise
GIA Colored Stones Final Exam
Complete Test bank and Updated Study
Guide with Verified Answers
A gem produced by, or derived from, a living organism is ANSWER: Organic
Which of the following is an organic gem? ANSWER: Amber
A substance that consist of atoms of only one kind is a ANSWER: Chemical
element
A natural, in organic substance with a characteristic chemical composition and
usually characteristic crystal structure is a(n) ANSWER: Mineral
Most gems are ANSWER: Mineral
A natural material that's made up of a mass of one or more kind of mineral crystals
is a ANSWER: Rock
The broad gem categories based on chemical composition and crystal structure is a
ANSWER: Gem species
The worlds largest gem consuming market is ANSWER: The United states
Synthetic gem materials ANSWER: Are not minerals
,2|Page
To be a gym, a mineral must be beautiful, durable, and ANSWER: Rare
Many colored stones are mined by ANSWER: Independent minors using small
scale mining methods
Media attention in the 1990s regarding its treatment reduced consumer confidence
in ANSWER: Emeralds
Most gemstones form in the ANSWER: continental crust
Rocks altered by heat and pressure are ANSWER: Metamorphic
Which gem can crystallize in volcanic rock from gas is released by magma?
ANSWER: Red beryl
Which is a key locality for hydrothermal gems ANSWER: Ouro Preto, Brazil
Heat and pressure transform lime stone into ANSWER: Marble
A deposit were gyms are found in the rocks where they formed is called
ANSWER: Primary
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Which type of deposit is usually the most profitable for colored stone mining
ANSWER: Secondary
Which is a deposit were gems eroded from the source rock and remain in place
nearby ANSWER: Eluvial
Kunzite is most often found in association with ANSWER: tourmaline and beryl
in pegmatite
Myanmar's famous mogok ruby deposits were formed by ANSWER: Metamorphic
process
From granite, pegmatite gyms get exotic elements like ANSWER: Beryllium,
boron, and lithium
Emeralds are rarely found in place or deposits because they are ANSWER: Unable
to withstand much abrasion
A unit cell defines a minerals ANSWER: Basic identity
Crystals that grow in a flux that is highly saturated with the necessary elements
tend to be ANSWER: Small
Which aggregate's crystals are visible only under high magnification ANSWER:
Cryptocrystalline
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Which is classified in the orthorhombic Crystal system ANSWER: Topaz
Which element causes red in Ruby and green emerald ANSWER: Chromium
Which type of twinning is caused by environmental change after the gem forms
ANSWER: Polysynthetic
Which type of twinning looks as if to crystals halves are mirror images ANSWER:
Contact
Needles of actinolite found in emerald are classified as ANSWER: Inclusions
Two phase inclusion are typically filled with ANSWER: A liquid and a gas
Atoms in a gem that are not part of its essential chemical composition are
ANSWER: Trace elements
The trace elements that Costco random's blue are ANSWER: Iron and titanium
How heavy an object is in relation to each size is its ANSWER: Density
Which gems are cryptocrystalline aggregates ANSWER: Chalcedony and
turquoise
