LATEST 2025/2026 GIA COLORED STONE FINAL EXAM
WITH COMPLETE QUESTIONS AND DETAILED
CORRECT VERIFIED ANSWERS (EXPERTLY VERIFIED)
Page | 1
GUARANTEED PASS|ALREADY TOP RATED A+
GIA
Prepare for the GIA Colored Stone final exam 2025/2026 with this comprehensive.
Covers questions in key topics like gemstone identification, grading, treatments,
and industry standards.
Perfect for gemology students aiming to excel in their certification.
Which of the following is a gem variety? Assignment 1 ...... ANSWER ....... demantoid
A substance that consists of atoms of only one kind is a. Assignment 1 ...... ANSWER .......
chemical element
Which of the following is an organic gem? Assignment 1 ...... ANSWER ....... amber
Many colored stones are mined by. Assignment 1 ...... ANSWER ....... independent miners
using small-scale mining methods.
Which group does almandine belong to? Assignment 1 ...... ANSWER ....... Garnet
Synthetic gem materials. Assignment 1 ...... ANSWER ....... Are not mineral
A broad gem category based on chemical composition and crystal structure is a. Assignment
1 ...... ANSWER ....... gem species
A natural, inorganic substance with a characteristic chemical composition and usually
characteristic crystal structure is a(n). Assignment 1 ...... ANSWER ....... Mineral
, The world's largest gem-consuming market is. Assignment 1 ...... ANSWER ....... United
States
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Which of the following is amorphous? Assignment 1 ...... ANSWER ....... amber
A gem produced by, or derived from, a living organism is. Assignment 1 ...... ANSWER .......
organic
Most gems are. Assignment 1 ...... ANSWER ....... minerals
To be a gem, a mineral must be beautiful, durable, and. Assignment 1 ...... ANSWER .......
rare
Media attention in the 1990s regarding its treatment reduced consumer confidence in.
Assignment 1 ...... ANSWER ....... emerald
A natural material that's made up of a mass of one or more kinds of mineral crystals is a.
Assignment 1 ...... ANSWER ....... Rock.
Myanmar's famous Mogok ruby deposits were formed by. Assignment 2 ...... ANSWER .......
metamorphic processes.
Heat and pressure transform limestone into. Assignment 2 ...... ANSWER ....... marble
Which gem can crystallize in volcanic rock from gases released by magma? Assignment 2 ......
ANSWER ....... Red beryl
Which is a deposit where gems eroded from the source rock and remained in place nearby?
Assignment 2 ...... ANSWER ....... Eluvial
, Most gemstones form in the. Assignment 2 ...... ANSWER ....... continental crust
From granite, pegmatite gems get exotic elements like. Assignment 2 ...... ANSWER .......
beryllium, boron, and lithium.
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Which is a key locality for hydrothermal gems? Assignment 2 ...... ANSWER ....... Ouro
Preto, Brazil
Which gem forms by metamorphism? Assignment 2 ...... ANSWER ....... Tanzanite
Emeralds are rarely found in placer deposits because they're. Assignment 2 ......
ANSWER ....... unable to withstand much abrasion.
Most of the gems in Tanzania's Umba River Valley are found in. Assignment 2 ......
ANSWER ....... Placers deposit
A deposit where gems are found in the rocks where they formed is called. Assignment 2 ......
ANSWER ....... primary
Which is a workable alluvial deposit of gem minerals with economic potential? Assignment
2 ...... ANSWER ....... placers
Which type of deposit is usually the most profitable for colored stone mining? Assignment
2 ...... ANSWER ....... secondary
Rocks altered by heat and pressure are. Assignment 2 ...... ANSWER ....... Metamorphic
Kunzite is most often found in association with. Assignment 2 ...... ANSWER .......
tourmaline and beryl in pegmatite.
A two-phase inclusion is a cavity in a gem that's typically filled with. Assignments 3 ......
ANSWER ....... a liquid and a gas
, Which type of twinning looks as if two crystal halves are mirror images? Assignment 3 ......
ANSWER ....... contact
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Many fashioned rubies have shallow proportions because they're cut from. Assignment 3 ......
ANSWER ....... flattened crystals.
Which aggregate's crystals are visible only under very high magnification? Assignment 3 ......
ANSWER ....... Cryptocrystalline
Crystals that grow in a flux that is highly saturated with the necessary elements tend to be.
Assignment 3 ...... ANSWER ....... small
Atoms in a gem that are not part of its essential chemical composition are. Assignment 3 ......
ANSWER ....... trace elements
The trace elements that cause corundum's blue are. Assignment 3 ...... ANSWER ....... iron
and titanium.
How heavy an object is in relation to its size is called its. Assignment 3 ...... ANSWER .......
Density
Which element causes red in ruby and green in emerald? Assignment 3 ...... ANSWER .......
Chromium
Needles of actinolite found in emerald are classified as. Assignment 3 ...... ANSWER .......
inclusions
A unit cell defines a mineral's. Assignment 3 ...... ANSWER ....... basic identity.
Rough spinel often occurs as. Assignment 3 ...... ANSWER ....... twinned crystals
WITH COMPLETE QUESTIONS AND DETAILED
CORRECT VERIFIED ANSWERS (EXPERTLY VERIFIED)
Page | 1
GUARANTEED PASS|ALREADY TOP RATED A+
GIA
Prepare for the GIA Colored Stone final exam 2025/2026 with this comprehensive.
Covers questions in key topics like gemstone identification, grading, treatments,
and industry standards.
Perfect for gemology students aiming to excel in their certification.
Which of the following is a gem variety? Assignment 1 ...... ANSWER ....... demantoid
A substance that consists of atoms of only one kind is a. Assignment 1 ...... ANSWER .......
chemical element
Which of the following is an organic gem? Assignment 1 ...... ANSWER ....... amber
Many colored stones are mined by. Assignment 1 ...... ANSWER ....... independent miners
using small-scale mining methods.
Which group does almandine belong to? Assignment 1 ...... ANSWER ....... Garnet
Synthetic gem materials. Assignment 1 ...... ANSWER ....... Are not mineral
A broad gem category based on chemical composition and crystal structure is a. Assignment
1 ...... ANSWER ....... gem species
A natural, inorganic substance with a characteristic chemical composition and usually
characteristic crystal structure is a(n). Assignment 1 ...... ANSWER ....... Mineral
, The world's largest gem-consuming market is. Assignment 1 ...... ANSWER ....... United
States
Page | 2
Which of the following is amorphous? Assignment 1 ...... ANSWER ....... amber
A gem produced by, or derived from, a living organism is. Assignment 1 ...... ANSWER .......
organic
Most gems are. Assignment 1 ...... ANSWER ....... minerals
To be a gem, a mineral must be beautiful, durable, and. Assignment 1 ...... ANSWER .......
rare
Media attention in the 1990s regarding its treatment reduced consumer confidence in.
Assignment 1 ...... ANSWER ....... emerald
A natural material that's made up of a mass of one or more kinds of mineral crystals is a.
Assignment 1 ...... ANSWER ....... Rock.
Myanmar's famous Mogok ruby deposits were formed by. Assignment 2 ...... ANSWER .......
metamorphic processes.
Heat and pressure transform limestone into. Assignment 2 ...... ANSWER ....... marble
Which gem can crystallize in volcanic rock from gases released by magma? Assignment 2 ......
ANSWER ....... Red beryl
Which is a deposit where gems eroded from the source rock and remained in place nearby?
Assignment 2 ...... ANSWER ....... Eluvial
, Most gemstones form in the. Assignment 2 ...... ANSWER ....... continental crust
From granite, pegmatite gems get exotic elements like. Assignment 2 ...... ANSWER .......
beryllium, boron, and lithium.
Page | 3
Which is a key locality for hydrothermal gems? Assignment 2 ...... ANSWER ....... Ouro
Preto, Brazil
Which gem forms by metamorphism? Assignment 2 ...... ANSWER ....... Tanzanite
Emeralds are rarely found in placer deposits because they're. Assignment 2 ......
ANSWER ....... unable to withstand much abrasion.
Most of the gems in Tanzania's Umba River Valley are found in. Assignment 2 ......
ANSWER ....... Placers deposit
A deposit where gems are found in the rocks where they formed is called. Assignment 2 ......
ANSWER ....... primary
Which is a workable alluvial deposit of gem minerals with economic potential? Assignment
2 ...... ANSWER ....... placers
Which type of deposit is usually the most profitable for colored stone mining? Assignment
2 ...... ANSWER ....... secondary
Rocks altered by heat and pressure are. Assignment 2 ...... ANSWER ....... Metamorphic
Kunzite is most often found in association with. Assignment 2 ...... ANSWER .......
tourmaline and beryl in pegmatite.
A two-phase inclusion is a cavity in a gem that's typically filled with. Assignments 3 ......
ANSWER ....... a liquid and a gas
, Which type of twinning looks as if two crystal halves are mirror images? Assignment 3 ......
ANSWER ....... contact
Page | 4
Many fashioned rubies have shallow proportions because they're cut from. Assignment 3 ......
ANSWER ....... flattened crystals.
Which aggregate's crystals are visible only under very high magnification? Assignment 3 ......
ANSWER ....... Cryptocrystalline
Crystals that grow in a flux that is highly saturated with the necessary elements tend to be.
Assignment 3 ...... ANSWER ....... small
Atoms in a gem that are not part of its essential chemical composition are. Assignment 3 ......
ANSWER ....... trace elements
The trace elements that cause corundum's blue are. Assignment 3 ...... ANSWER ....... iron
and titanium.
How heavy an object is in relation to its size is called its. Assignment 3 ...... ANSWER .......
Density
Which element causes red in ruby and green in emerald? Assignment 3 ...... ANSWER .......
Chromium
Needles of actinolite found in emerald are classified as. Assignment 3 ...... ANSWER .......
inclusions
A unit cell defines a mineral's. Assignment 3 ...... ANSWER ....... basic identity.
Rough spinel often occurs as. Assignment 3 ...... ANSWER ....... twinned crystals
