COLORED STONES FINAL EXAM 600 QUESTIONS &
CORRECT ANSWERS LATEST 2025
Velvety blue to violetish blue, in medium to medium-dark tones, with strong to
vivid saturation - ANSWER-Fine sapphire
What trace elements cause the blue of sapphire? - ANSWER-Iron and titanium
A smokey corundum that turns blue when treated - ANSWER-Dhun
Higher levels of iron make basalt-hosted sapphires ______ than non-basaltic
saphhires. - ANSWER-Darker
What is the trade name cosidered as the finest blue sapphire? - ANSWER-Kashmir
A common sapphire characteristic - ANSWER-Color zoning
Most sapphires are ______ to improve their appearance. - ANSWER-Heat treated
Fine quality, untreated sapphires make up ______ of the sapphire market. -
ANSWER-A small but extremely valuable segment
What country buys about half of the blue sapphires on the world market? -
ANSWER-USA
,Kashmir sapphires owe their reputation to a brief period of output during what time
period? - ANSWER-1880s
What country is a major center of the corrundum trade, funneling a steady flow of
gems from worldwide sources into the consumer market? - ANSWER-Thailand
What country is the world's largest source of dark blue, commercial quality blue
sapphires? - ANSWER-Australia
What country has become a significant source of good to fine qualtiy blue
sapphires? - ANSWER-Madagascar
The most common sapphire synthesis method - ANSWER-Flame fusion
Milky, greyish, or brownish corundum that can be treated to a fine blue color -
ANSWER-Geuda
Color of fine blue sapphire - ANSWER-Blue to violetish blue
Blue sapphires that orginate in basaltic rock generally have a... - ANSWER-Higher
iron content
Finer quality Kashmir blue sapphires typically show what type of appearance? -
ANSWER-Velvety
"Inky" sapphires generally originate from... - ANSWER-Australia
Most fine sapphires over 100 cts. come from what country? - ANSWER-Sri Lanka
,What country emerged in the 1990s as a significant source of fine to good quality
saphhire? - ANSWER-Madagascar
What country is the world's largest blue saphhire exporter? - ANSWER-Thailand
The sapphire market level supplied by Switzerland is - ANSWER-Upper
When did Madagascar become a significant source of blue sapphire? - ANSWER-
1990s
What location supplies sapphires that are most likely not heat-treated? -
ANSWER-Yogo Gulch
A Kashmir sapphire's blue is also known as - ANSWER-Cornflower blue
A Burmese sapphire's blue is known as ______ blue and is considered somewhat
_______. - ANSWER-Royal; inky
The "Ceylon" or "Sri Lanka" sapphire's saturation is ______ and ______.
The tone is ______ to ______. - ANSWER-Greyish and strong saturation
Light to medium light tone
The "Palin" or "Cambodian" sapphires are typically ______ to ______ in color and
look best when fashioned into smaller sizes. - ANSWER-Violetish blue to slightly
greenish blue
, The "Kanchanaburi" sapphires are less saturated and are gererally ______ to
______ in color with a ______ to ______ tone.
Minute inclusions cause it to have a greyish appearance.
(Similar to Sri Lanka, but not as brilliant) - ANSWER-Blue to greenish blue color
Light to dark tone
"Thai" sapphires are ______ to ______ in color and often described as ______ or
_______. - ANSWER-Violetish blue to slightly greenish blue
Inky blue or blue-black
Australian sapphires often show ______ plechroism. - ANSWER-Strong greenish
blue
Lapiz Lazuli is value for its ______ and rich ______ color. - ANSWER-History;
blue
What produces lapis lazuli's prized royal blue color? - ANSWER-Lazurite
Lapiz lazuli's value is based on color and the presence or absence of ______ or
______. - ANSWER-Calcite or pyrite
3 treatments used with lapis - ANSWER-1. dyed
2. impregnated with wax or plastic
3. heated then dyed
What country is the major source for lapis lazuli? - ANSWER-Afghanistan
CORRECT ANSWERS LATEST 2025
Velvety blue to violetish blue, in medium to medium-dark tones, with strong to
vivid saturation - ANSWER-Fine sapphire
What trace elements cause the blue of sapphire? - ANSWER-Iron and titanium
A smokey corundum that turns blue when treated - ANSWER-Dhun
Higher levels of iron make basalt-hosted sapphires ______ than non-basaltic
saphhires. - ANSWER-Darker
What is the trade name cosidered as the finest blue sapphire? - ANSWER-Kashmir
A common sapphire characteristic - ANSWER-Color zoning
Most sapphires are ______ to improve their appearance. - ANSWER-Heat treated
Fine quality, untreated sapphires make up ______ of the sapphire market. -
ANSWER-A small but extremely valuable segment
What country buys about half of the blue sapphires on the world market? -
ANSWER-USA
,Kashmir sapphires owe their reputation to a brief period of output during what time
period? - ANSWER-1880s
What country is a major center of the corrundum trade, funneling a steady flow of
gems from worldwide sources into the consumer market? - ANSWER-Thailand
What country is the world's largest source of dark blue, commercial quality blue
sapphires? - ANSWER-Australia
What country has become a significant source of good to fine qualtiy blue
sapphires? - ANSWER-Madagascar
The most common sapphire synthesis method - ANSWER-Flame fusion
Milky, greyish, or brownish corundum that can be treated to a fine blue color -
ANSWER-Geuda
Color of fine blue sapphire - ANSWER-Blue to violetish blue
Blue sapphires that orginate in basaltic rock generally have a... - ANSWER-Higher
iron content
Finer quality Kashmir blue sapphires typically show what type of appearance? -
ANSWER-Velvety
"Inky" sapphires generally originate from... - ANSWER-Australia
Most fine sapphires over 100 cts. come from what country? - ANSWER-Sri Lanka
,What country emerged in the 1990s as a significant source of fine to good quality
saphhire? - ANSWER-Madagascar
What country is the world's largest blue saphhire exporter? - ANSWER-Thailand
The sapphire market level supplied by Switzerland is - ANSWER-Upper
When did Madagascar become a significant source of blue sapphire? - ANSWER-
1990s
What location supplies sapphires that are most likely not heat-treated? -
ANSWER-Yogo Gulch
A Kashmir sapphire's blue is also known as - ANSWER-Cornflower blue
A Burmese sapphire's blue is known as ______ blue and is considered somewhat
_______. - ANSWER-Royal; inky
The "Ceylon" or "Sri Lanka" sapphire's saturation is ______ and ______.
The tone is ______ to ______. - ANSWER-Greyish and strong saturation
Light to medium light tone
The "Palin" or "Cambodian" sapphires are typically ______ to ______ in color and
look best when fashioned into smaller sizes. - ANSWER-Violetish blue to slightly
greenish blue
, The "Kanchanaburi" sapphires are less saturated and are gererally ______ to
______ in color with a ______ to ______ tone.
Minute inclusions cause it to have a greyish appearance.
(Similar to Sri Lanka, but not as brilliant) - ANSWER-Blue to greenish blue color
Light to dark tone
"Thai" sapphires are ______ to ______ in color and often described as ______ or
_______. - ANSWER-Violetish blue to slightly greenish blue
Inky blue or blue-black
Australian sapphires often show ______ plechroism. - ANSWER-Strong greenish
blue
Lapiz Lazuli is value for its ______ and rich ______ color. - ANSWER-History;
blue
What produces lapis lazuli's prized royal blue color? - ANSWER-Lazurite
Lapiz lazuli's value is based on color and the presence or absence of ______ or
______. - ANSWER-Calcite or pyrite
3 treatments used with lapis - ANSWER-1. dyed
2. impregnated with wax or plastic
3. heated then dyed
What country is the major source for lapis lazuli? - ANSWER-Afghanistan
