1|Page
GIA DIAMONDS AND DIAMOND GRADING
FINAL EXAM NEWEST 2025/2026
COMPLETE ALL 180 QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+||BRAND NEW
VERSION!!
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
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what group does alamandine belong to - . . ANSWER ✔
✔garnet
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
Media attention in the 1990s regarding its treatment
reduced consumer confidence in - . . ANSWER ✔
✔emerald
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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
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
Which type of deposit is usually the most profitable for
colored stone mining? - . . ANSWER ✔ ✔secondary
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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 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
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
GIA DIAMONDS AND DIAMOND GRADING
FINAL EXAM NEWEST 2025/2026
COMPLETE ALL 180 QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+||BRAND NEW
VERSION!!
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
,2|Page
what group does alamandine belong to - . . ANSWER ✔
✔garnet
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
Media attention in the 1990s regarding its treatment
reduced consumer confidence in - . . ANSWER ✔
✔emerald
,3|Page
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
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
Which type of deposit is usually the most profitable for
colored stone mining? - . . ANSWER ✔ ✔secondary
, 4|Page
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 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
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
