1
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GIA Colored Stones Questions and
Answers (100% Correct Answers) Already
Graded A+
The pleochroic colors of ruby are typically. [ANS:] red, and purplish
red (up) ; Or (right).
Marble Hosted Sources of Ruby - FIVE [ANS:] Myanmar, Northern
Vietnam, Afghanistan , Tajikistan and Pakistan
© 2025 Assignment Expert
Ruby's Crystal System and Habit. [ANS:] trigonal - Tablular Hex Prism
Most Historically Significant Ruby Source [ANS:] Mogok, Myanmar
Guru01 - Stuvia
(most rubies through 90s)
Most Significant Producer of Ruby. [ANS:] Mozambique
Who cuts most ruby and where? [ANS:] Thailand - Bangkok and
Chanthaburi.
Which Sapphire type has a velvety appearance and cornflower
blue color [ANS:] Kashmir
Burmese Sapphire Color. [ANS:] More intense and saturated, can
be inky
Which sapphire source has a lighter color and is more brilliant than
other fine sources? [ANS:] Ceylon/Sri Lanka
What is the trade term for Cambodian Sapphires with a velvety
color (also basalt) [ANS:] Pailin sapphire
, 2
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Basalt Related Sources of Sapphire - name the four: [ANS:]
Cambodia, Thailand, Nigeria and Australia
Sapphires caused by xenocyrsts are found at [ANS:] Yogo Gulch,
Montana
Crystal System and Habit of Sapphire [ANS:] Trigonal - Spindle
shaped hex pyramid or bipyramid
what is Crystal System and Habit of Emerald? [ANS:] Hexagonal -
elongated, six sided prisms
© 2025 Assignment Expert
Crystal System and Habit of Topaz. [ANS:] Orthorombic -
elongated crystals
Guru01 - Stuvia
Australian Sapphire color description [ANS:] Inky
Pleochroic colors of sapphire [ANS:] Vb - up, vb and gb- right
Source of most commercial blue sapphire [ANS:] Madagascar
(significant), Australia, Sri Lanka and Nigeria
Source of Most fine sapphires over 100 carats [ANS:] Sri Lanka
Major cutting center for Sapphire [ANS:] Thailand
Major Source of Dark Blue, Commercial Sapphire [ANS:] Australia
Traditional source of padparadscha Sapphire [ANS:] Sri Lanka
Cause of Color for Green Sapphire [ANS:] Yellow (iron) and blue
(iron & titanium intervalence charge transfer)
Cause of Color Change Sapphire [ANS:] Vanadium
, 3
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Source of Widest Range of Sapphire Colors [ANS:] Sri Lanka
Source with most potential for corundum colors [ANS:] East Africa
Major source of high quality pink sapphire [ANS:] Madagascar
Secondary Source of Pink and purple, red, pads [ANS:] Vietnam
(chromium color agent)
What sapphire colors are mined in Thailand? Chanthaburi [ANS:]
Blue, Yellow, Green, Blue and Black Stars - Main Source (IRON)
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Where are black sapphires found? (2 locations) [ANS:] Thailand
and Australia
Guru01 - Stuvia
When was vanadium added as a cause of green emerald, and
from what country? [ANS:] 1963 - Brazil
What are the three trade terms of Emerald's color? [ANS:]
Colombian, Zambian, Sandawaya
What is habit of Emerald Crystal? [ANS:] Hexagonal - Elongated 6-
sided prism
Where are emeralds found? [ANS:] Metamorphic where
pegmatites intersect with Schists
How are emeralds mined? [ANS:] From hard rock surfaces
Main sources of emerald are [ANS:] Columbia and Brazil (Minas
Gerais and Bahia States) and Zambia
Source of Emeralds in Africa [ANS:] Zambia (Kagem Mine) 20% of
all emeralds
For Expert help and assignment solutions, +254707240657
GIA Colored Stones Questions and
Answers (100% Correct Answers) Already
Graded A+
The pleochroic colors of ruby are typically. [ANS:] red, and purplish
red (up) ; Or (right).
Marble Hosted Sources of Ruby - FIVE [ANS:] Myanmar, Northern
Vietnam, Afghanistan , Tajikistan and Pakistan
© 2025 Assignment Expert
Ruby's Crystal System and Habit. [ANS:] trigonal - Tablular Hex Prism
Most Historically Significant Ruby Source [ANS:] Mogok, Myanmar
Guru01 - Stuvia
(most rubies through 90s)
Most Significant Producer of Ruby. [ANS:] Mozambique
Who cuts most ruby and where? [ANS:] Thailand - Bangkok and
Chanthaburi.
Which Sapphire type has a velvety appearance and cornflower
blue color [ANS:] Kashmir
Burmese Sapphire Color. [ANS:] More intense and saturated, can
be inky
Which sapphire source has a lighter color and is more brilliant than
other fine sources? [ANS:] Ceylon/Sri Lanka
What is the trade term for Cambodian Sapphires with a velvety
color (also basalt) [ANS:] Pailin sapphire
, 2
For Expert help and assignment solutions, +254707240657
Basalt Related Sources of Sapphire - name the four: [ANS:]
Cambodia, Thailand, Nigeria and Australia
Sapphires caused by xenocyrsts are found at [ANS:] Yogo Gulch,
Montana
Crystal System and Habit of Sapphire [ANS:] Trigonal - Spindle
shaped hex pyramid or bipyramid
what is Crystal System and Habit of Emerald? [ANS:] Hexagonal -
elongated, six sided prisms
© 2025 Assignment Expert
Crystal System and Habit of Topaz. [ANS:] Orthorombic -
elongated crystals
Guru01 - Stuvia
Australian Sapphire color description [ANS:] Inky
Pleochroic colors of sapphire [ANS:] Vb - up, vb and gb- right
Source of most commercial blue sapphire [ANS:] Madagascar
(significant), Australia, Sri Lanka and Nigeria
Source of Most fine sapphires over 100 carats [ANS:] Sri Lanka
Major cutting center for Sapphire [ANS:] Thailand
Major Source of Dark Blue, Commercial Sapphire [ANS:] Australia
Traditional source of padparadscha Sapphire [ANS:] Sri Lanka
Cause of Color for Green Sapphire [ANS:] Yellow (iron) and blue
(iron & titanium intervalence charge transfer)
Cause of Color Change Sapphire [ANS:] Vanadium
, 3
For Expert help and assignment solutions, +254707240657
Source of Widest Range of Sapphire Colors [ANS:] Sri Lanka
Source with most potential for corundum colors [ANS:] East Africa
Major source of high quality pink sapphire [ANS:] Madagascar
Secondary Source of Pink and purple, red, pads [ANS:] Vietnam
(chromium color agent)
What sapphire colors are mined in Thailand? Chanthaburi [ANS:]
Blue, Yellow, Green, Blue and Black Stars - Main Source (IRON)
© 2025 Assignment Expert
Where are black sapphires found? (2 locations) [ANS:] Thailand
and Australia
Guru01 - Stuvia
When was vanadium added as a cause of green emerald, and
from what country? [ANS:] 1963 - Brazil
What are the three trade terms of Emerald's color? [ANS:]
Colombian, Zambian, Sandawaya
What is habit of Emerald Crystal? [ANS:] Hexagonal - Elongated 6-
sided prism
Where are emeralds found? [ANS:] Metamorphic where
pegmatites intersect with Schists
How are emeralds mined? [ANS:] From hard rock surfaces
Main sources of emerald are [ANS:] Columbia and Brazil (Minas
Gerais and Bahia States) and Zambia
Source of Emeralds in Africa [ANS:] Zambia (Kagem Mine) 20% of
all emeralds
