GIA COLORED STONE FINAL EXAM QUIZZES
WITH ACCURATE ANSWERS.
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
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
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
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
,A deposit where gems are found in the rock that where they formed is called ANSWER : - primary
deposit
Which is a key locality for hydrothermal gems? ANSWER : - Ouro Preto, Brazil
Heat and pressure transform limestone into ANSWER : - marble
which gem form by metamophosis ANSWER : - tanzanite
Most gemstones form in the ANSWER : - continental crust
kunzite is most often associated with ANSWER : - tourmaline and beryl in pegmatites
how heavy an object is in relation to its size ANSWER : - density
A two-phase inclusion is a cavity in a gem that's typically filled with a ANSWER : - liquid and a gas
which type of twinning is caused by environmental change after a gem forms ANSWER : - polysynthetic
which element caused red in ruby and green in emerald ANSWER : - chromium
A unit cell defines a mineral's ANSWER : - basic identity
which type of twinning looks as if two crystal halves are mirror images ANSWER : - contact twinning
crystals that grow in a flux that is highly saturated with the necessary elements tend to be - ANSWER : -
small
which is classified in the orthorhombic crystal system ANSWER : - topaz
, Which gems are cryptocrystalline aggregates? ANSWER : - Chalcedony and turquoise
Atoms in a gem that aren't part of its essential chemical composition are called ANSWER : - trace
elements
Many fashioned rubies have shallow proportions because they're cut from ANSWER : - flattened crystals
Rough spinel often occurs as ANSWER : - twinned crystals
Needles of actinolite found in emerald are classified as ANSWER : - inclusions
which aggregates crystals are visible only under very high magnification ANSWER : - cryptocrystalline
the trace elements that cause corundum's blue are ANSWER : - iron and titanium
what element does chromium substitute for to cause ruby's red ANSWER : - aluminium
In many blue sapphires, the intervalence charge transfer that causes the color is between ANSWER : -
iron and titanium
The pattern of dark vertical lines or bands shown by certain gems when viewed through a spectroscope
is called ANSWER : - absorption spectrum
the process where electrons that selectively absorb light are passed back and forth between neighboring
impurity ions is known as ANSWER : - charge transfer
what element causes the color of both alamandine and peridot ANSWER : - iron
the best known and most valuable chatoyant gems is a cat's eye ANSWER : - chrysoberyl
WITH ACCURATE ANSWERS.
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
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
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
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
,A deposit where gems are found in the rock that where they formed is called ANSWER : - primary
deposit
Which is a key locality for hydrothermal gems? ANSWER : - Ouro Preto, Brazil
Heat and pressure transform limestone into ANSWER : - marble
which gem form by metamophosis ANSWER : - tanzanite
Most gemstones form in the ANSWER : - continental crust
kunzite is most often associated with ANSWER : - tourmaline and beryl in pegmatites
how heavy an object is in relation to its size ANSWER : - density
A two-phase inclusion is a cavity in a gem that's typically filled with a ANSWER : - liquid and a gas
which type of twinning is caused by environmental change after a gem forms ANSWER : - polysynthetic
which element caused red in ruby and green in emerald ANSWER : - chromium
A unit cell defines a mineral's ANSWER : - basic identity
which type of twinning looks as if two crystal halves are mirror images ANSWER : - contact twinning
crystals that grow in a flux that is highly saturated with the necessary elements tend to be - ANSWER : -
small
which is classified in the orthorhombic crystal system ANSWER : - topaz
, Which gems are cryptocrystalline aggregates? ANSWER : - Chalcedony and turquoise
Atoms in a gem that aren't part of its essential chemical composition are called ANSWER : - trace
elements
Many fashioned rubies have shallow proportions because they're cut from ANSWER : - flattened crystals
Rough spinel often occurs as ANSWER : - twinned crystals
Needles of actinolite found in emerald are classified as ANSWER : - inclusions
which aggregates crystals are visible only under very high magnification ANSWER : - cryptocrystalline
the trace elements that cause corundum's blue are ANSWER : - iron and titanium
what element does chromium substitute for to cause ruby's red ANSWER : - aluminium
In many blue sapphires, the intervalence charge transfer that causes the color is between ANSWER : -
iron and titanium
The pattern of dark vertical lines or bands shown by certain gems when viewed through a spectroscope
is called ANSWER : - absorption spectrum
the process where electrons that selectively absorb light are passed back and forth between neighboring
impurity ions is known as ANSWER : - charge transfer
what element causes the color of both alamandine and peridot ANSWER : - iron
the best known and most valuable chatoyant gems is a cat's eye ANSWER : - chrysoberyl
