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GIA Colored Stones Exam Updated Version Questions And
Correct Verified Answers
Amber is actually - CORRECT ANSWER=hardened tree resin
6
Which of the following is a variety of conchiolin coral - CORRECT ANSWER=black coral
The finest aquamarine color is moderately strong, - CORRECT ANSWER=medium-dark blue
2
to slightly greenish blue.
20
Light-colored or colorless spodumene can be treated to a kunzite color by - CORRECT
ANSWER=irradiation followed by careful heating.
am
Value Factors - CORRECT ANSWER=Features used to judge the quality and value of pearls.
Ex
Cultured Pearl -CORRECTANSWER=Apearl formed as the result of human intervention in
the formation process.
Uniform Strand - CORRECT ANSWER=Anecklace featuring pearls that are very nearly the
s
same size.
rt
pe
Aragonite -CORRECTANSWER=crystallized form of calcium carbonate found in nacre.
Ex
Processor -CORRECTANSWER=Acompany that prepares cultured pearls for the market.
Conchilolin- CORRECT ANSWER=The organic "glue" in nacre that holds aragonite platelets
together.
,Experts think fire opal's background color is caused by - CORRECT ANSWER=iron impurities.
In opal, a pattern of large, distinct, usually rectangular patches of play-of-color with edges
that touch each is called - CORRECT ANSWER=harlequin.
Play-of-color that’s seen only when light travels through an opal to the eye called -
6
CORRECT ANSWER=contra luz.
2
20
The first black opals were discovered in - CORRECT ANSWER=New South Wales.
What is the first step in evaluating an opal ? - CORRECT ANSWER=Determine its type
am
Which treatment involves immersing opal in concentrated sulfuric acid ? -
CORRECT ANSWER=Sugar
Ex
Who created the first marketable synthetic opal ? - CORRECT ANSWER=Pierre Gilson
ts
Plastic imitation opal was first marketed in the late 1980s in - CORRECTANSWER=Japa.
r
Cryptocrystalline quartz is known as - CORRECT ANSWER=chalcedony.
pe
Chalcedony with curved or angular bands or layers that differ in color and transparency is
Ex
known as - CORRECT ANSWER=agate.
Which of the following has the smallest crystal size ? -CORRECT ANSWER=Cryptocrystalline
aggregates
In the nineteenth century, a major source of amethyst was discovered in -
CORRECT ANSWER=Brazil.
,The color of amethyst results from - CORRECT ANSWER=color centers acting on iron.
One of amethyst's finest colors is - CORRECT ANSWER=medium-dark strong reddish purple.
6
The major commercial-quality amethyst source is - CORRECTANSWER=Bazi
2
20
"Maraba" amethyst is often - CORRECT ANSWER=uniform in color.
Dark amethyst is lightened by - CORRECT ANSWER=heating.
am
Most of the citrine in the market is - CORRECT ANSWER=produced by heating amethyst.
Ex
The source of natural ametrine is - CORRECT ANSWER=Bolivia.
Tiger's-eye quartz is a - CORRECT ANSWER=cryptocrystalline aggregate.
s
rt
Which of the following gems has chatoyancy that's caused by multiple slender crystals or
channels ? - CORRECT ANSWER=Cat's-eye quartz
pe
The color of chrysoprase is - CORRECT ANSWER=yellowish green.
Ex
The trade term ′ ′ b1lack onyx" is used for - CORRECT ANSWER=treated black chalcedony.
Which of the following gems is the most economically important ? - CORRECT
ANSWER=Tanzanite
Where was tanzanite discovered ? - CORRECT ANSWER=Merelani
, The name tanzanite was given to transparent blue zoisite by - CORRECT ANSWER=Tiffany
&Co.
Tanzanite's best color is - CORRECT ANSWER=strongly saturated blue or violetish blue.
2 6
Almost all tanzanite is - CORRECT ANSWER=heat-treated.
20
Untreated tanzanite is typically-CORRECTANSWER=brownih.
Tanavyte is a trade name for - CORRECT ANSWER=purple synthetic YAG.
am
In iolite, the most valuable main face-up color is - CORRECT ANSWER=blue.
Ex
Top-color iolite is - CORRECT ANSWER=untreated.
ts
Alexandrite was discovered in - CORRECT ANSWER=1830.
r
The color change in alexandrite is caused by - CORRECT ANSWER=chromium.
pe
What changes during alexandrite color-change effect ? - CORRECT ANSWER=Hue
Ex
What color is top-quality alexandrite in daylight ? - CORRECT ANSWER=Bluish green
The most-prized chatoyant gem in the world is - CORRECT ANSWER=cat’s-eye chrysoberyl.
Which of the following is a major source of cat's-eye chrysoberyl ? - CORRECT ANSWER=Sri
Lanka
GIA Colored Stones Exam Updated Version Questions And
Correct Verified Answers
Amber is actually - CORRECT ANSWER=hardened tree resin
6
Which of the following is a variety of conchiolin coral - CORRECT ANSWER=black coral
The finest aquamarine color is moderately strong, - CORRECT ANSWER=medium-dark blue
2
to slightly greenish blue.
20
Light-colored or colorless spodumene can be treated to a kunzite color by - CORRECT
ANSWER=irradiation followed by careful heating.
am
Value Factors - CORRECT ANSWER=Features used to judge the quality and value of pearls.
Ex
Cultured Pearl -CORRECTANSWER=Apearl formed as the result of human intervention in
the formation process.
Uniform Strand - CORRECT ANSWER=Anecklace featuring pearls that are very nearly the
s
same size.
rt
pe
Aragonite -CORRECTANSWER=crystallized form of calcium carbonate found in nacre.
Ex
Processor -CORRECTANSWER=Acompany that prepares cultured pearls for the market.
Conchilolin- CORRECT ANSWER=The organic "glue" in nacre that holds aragonite platelets
together.
,Experts think fire opal's background color is caused by - CORRECT ANSWER=iron impurities.
In opal, a pattern of large, distinct, usually rectangular patches of play-of-color with edges
that touch each is called - CORRECT ANSWER=harlequin.
Play-of-color that’s seen only when light travels through an opal to the eye called -
6
CORRECT ANSWER=contra luz.
2
20
The first black opals were discovered in - CORRECT ANSWER=New South Wales.
What is the first step in evaluating an opal ? - CORRECT ANSWER=Determine its type
am
Which treatment involves immersing opal in concentrated sulfuric acid ? -
CORRECT ANSWER=Sugar
Ex
Who created the first marketable synthetic opal ? - CORRECT ANSWER=Pierre Gilson
ts
Plastic imitation opal was first marketed in the late 1980s in - CORRECTANSWER=Japa.
r
Cryptocrystalline quartz is known as - CORRECT ANSWER=chalcedony.
pe
Chalcedony with curved or angular bands or layers that differ in color and transparency is
Ex
known as - CORRECT ANSWER=agate.
Which of the following has the smallest crystal size ? -CORRECT ANSWER=Cryptocrystalline
aggregates
In the nineteenth century, a major source of amethyst was discovered in -
CORRECT ANSWER=Brazil.
,The color of amethyst results from - CORRECT ANSWER=color centers acting on iron.
One of amethyst's finest colors is - CORRECT ANSWER=medium-dark strong reddish purple.
6
The major commercial-quality amethyst source is - CORRECTANSWER=Bazi
2
20
"Maraba" amethyst is often - CORRECT ANSWER=uniform in color.
Dark amethyst is lightened by - CORRECT ANSWER=heating.
am
Most of the citrine in the market is - CORRECT ANSWER=produced by heating amethyst.
Ex
The source of natural ametrine is - CORRECT ANSWER=Bolivia.
Tiger's-eye quartz is a - CORRECT ANSWER=cryptocrystalline aggregate.
s
rt
Which of the following gems has chatoyancy that's caused by multiple slender crystals or
channels ? - CORRECT ANSWER=Cat's-eye quartz
pe
The color of chrysoprase is - CORRECT ANSWER=yellowish green.
Ex
The trade term ′ ′ b1lack onyx" is used for - CORRECT ANSWER=treated black chalcedony.
Which of the following gems is the most economically important ? - CORRECT
ANSWER=Tanzanite
Where was tanzanite discovered ? - CORRECT ANSWER=Merelani
, The name tanzanite was given to transparent blue zoisite by - CORRECT ANSWER=Tiffany
&Co.
Tanzanite's best color is - CORRECT ANSWER=strongly saturated blue or violetish blue.
2 6
Almost all tanzanite is - CORRECT ANSWER=heat-treated.
20
Untreated tanzanite is typically-CORRECTANSWER=brownih.
Tanavyte is a trade name for - CORRECT ANSWER=purple synthetic YAG.
am
In iolite, the most valuable main face-up color is - CORRECT ANSWER=blue.
Ex
Top-color iolite is - CORRECT ANSWER=untreated.
ts
Alexandrite was discovered in - CORRECT ANSWER=1830.
r
The color change in alexandrite is caused by - CORRECT ANSWER=chromium.
pe
What changes during alexandrite color-change effect ? - CORRECT ANSWER=Hue
Ex
What color is top-quality alexandrite in daylight ? - CORRECT ANSWER=Bluish green
The most-prized chatoyant gem in the world is - CORRECT ANSWER=cat’s-eye chrysoberyl.
Which of the following is a major source of cat's-eye chrysoberyl ? - CORRECT ANSWER=Sri
Lanka
