GIA Colored Stone Final Exam
COMPREHENSIVE QUESTIONS AND
VERIFIED ANSWERS (2026) EXAM|
ALREADY GRADED A+
By what date had Kokichi Mikimoto begun culturing whole pearls -CORRECTANSWER
1908
Synthetic gem materials -CORRECTANSWER Are not minerals
which of the following is an organic gem -CORRECTANSWER amber
which of the following is amorphous -CORRECTANSWER amber
a natural material that's made up of a mass of one or more kinds of mineral crystals is -
CORRECTANSWER rock
what group does alamandine belong to -CORRECTANSWER garnet
A gem produced by, or derived from, a living organism is -CORRECTANSWER organic
which of the following is a gem variety -CORRECTANSWER demantoid
,the world's largest gem-consuming market is -CORRECTANSWER the US
a substance that consists of atoms of only one kind is a -CORRECTANSWER chemical
element
Media attention in the 1990s regarding its treatment reduced consumer confidence in -
CORRECTANSWER emerald
a natural, inorganic substance with a characteristic chemical composition and usual
crystal structure is a -CORRECTANSWER mineral
most gems are -CORRECTANSWER minerals
To be a gem, a mineral must be beautiful, durable, and -CORRECTANSWER rare
a broad gem category based on chemical composition and crystal structure is called a -
CORRECTANSWER gem species
Many colored stones are mined by -CORRECTANSWER independent miners using
small-scale mining methods.
Rocks altered by heat and pressure beneath Earth's surface are -CORRECTANSWER
metamorphic
,Which type of deposit is usually the most profitable for colored stone mining? -
CORRECTANSWER secondary
Which gem can crystallize in volcanic rock from gasses released by magma? -
CORRECTANSWER red beryl
Emeralds are rarely found in placer deposits because they're -CORRECTANSWER
unable to withstand much abrasion
Which is a workable alluvial deposit of gem minerals with economic potential? -
CORRECTANSWER placers
Which is a deposit where gems eroded from the source rock and remained in place
nearby? -CORRECTANSWER eluvial
from granite, pegmatite gems get exotic elements like -CORRECTANSWER beryllium,
boron, and lithium
Myanmar's famous Mogok ruby deposits were formed by -CORRECTANSWER
metamorphic process
, most of the gems in tanzania's umba river valley are formed in -CORRECTANSWER
placer deposits
A deposit where gems are found in the rock that where they formed is called -
CORRECTANSWER primary deposit
Which is a key locality for hydrothermal gems? -CORRECTANSWER Ouro Preto, Brazil
Heat and pressure transform limestone into -CORRECTANSWER marble
which gem form by metamophosis -CORRECTANSWER tanzanite
Most gemstones form in the -CORRECTANSWER continental crust
kunzite is most often associated with -CORRECTANSWER tourmaline and beryl in
pegmatites
how heavy an object is in relation to its size -CORRECTANSWER density
A two-phase inclusion is a cavity in a gem that's typically filled with a -
CORRECTANSWER liquid and a gas
COMPREHENSIVE QUESTIONS AND
VERIFIED ANSWERS (2026) EXAM|
ALREADY GRADED A+
By what date had Kokichi Mikimoto begun culturing whole pearls -CORRECTANSWER
1908
Synthetic gem materials -CORRECTANSWER Are not minerals
which of the following is an organic gem -CORRECTANSWER amber
which of the following is amorphous -CORRECTANSWER amber
a natural material that's made up of a mass of one or more kinds of mineral crystals is -
CORRECTANSWER rock
what group does alamandine belong to -CORRECTANSWER garnet
A gem produced by, or derived from, a living organism is -CORRECTANSWER organic
which of the following is a gem variety -CORRECTANSWER demantoid
,the world's largest gem-consuming market is -CORRECTANSWER the US
a substance that consists of atoms of only one kind is a -CORRECTANSWER chemical
element
Media attention in the 1990s regarding its treatment reduced consumer confidence in -
CORRECTANSWER emerald
a natural, inorganic substance with a characteristic chemical composition and usual
crystal structure is a -CORRECTANSWER mineral
most gems are -CORRECTANSWER minerals
To be a gem, a mineral must be beautiful, durable, and -CORRECTANSWER rare
a broad gem category based on chemical composition and crystal structure is called a -
CORRECTANSWER gem species
Many colored stones are mined by -CORRECTANSWER independent miners using
small-scale mining methods.
Rocks altered by heat and pressure beneath Earth's surface are -CORRECTANSWER
metamorphic
,Which type of deposit is usually the most profitable for colored stone mining? -
CORRECTANSWER secondary
Which gem can crystallize in volcanic rock from gasses released by magma? -
CORRECTANSWER red beryl
Emeralds are rarely found in placer deposits because they're -CORRECTANSWER
unable to withstand much abrasion
Which is a workable alluvial deposit of gem minerals with economic potential? -
CORRECTANSWER placers
Which is a deposit where gems eroded from the source rock and remained in place
nearby? -CORRECTANSWER eluvial
from granite, pegmatite gems get exotic elements like -CORRECTANSWER beryllium,
boron, and lithium
Myanmar's famous Mogok ruby deposits were formed by -CORRECTANSWER
metamorphic process
, most of the gems in tanzania's umba river valley are formed in -CORRECTANSWER
placer deposits
A deposit where gems are found in the rock that where they formed is called -
CORRECTANSWER primary deposit
Which is a key locality for hydrothermal gems? -CORRECTANSWER Ouro Preto, Brazil
Heat and pressure transform limestone into -CORRECTANSWER marble
which gem form by metamophosis -CORRECTANSWER tanzanite
Most gemstones form in the -CORRECTANSWER continental crust
kunzite is most often associated with -CORRECTANSWER tourmaline and beryl in
pegmatites
how heavy an object is in relation to its size -CORRECTANSWER density
A two-phase inclusion is a cavity in a gem that's typically filled with a -
CORRECTANSWER liquid and a gas
