Colored Stones Final Exam Questions with 100% Correct Answers
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Colored Stones
Institution
Colored Stones
Colored Stones Final Exam Questions
with 100% Correct Answers
Velvety blue to violetish blue, in medium to medium-dark tones, with strong
to vivid saturation - Fine sapphire
What trace elements cause the blue of sapphire? - Iron and titanium
A smokey corundum that turns blue when treated - Dhu...
Velvety blue to violetish blue, in medium to medium-dark tones, with strong
to vivid saturation - ✔✔Fine sapphire
What trace elements cause the blue of sapphire? - ✔✔Iron and titanium
A smokey corundum that turns blue when treated - ✔✔Dhun
Higher levels of iron make basalt-hosted sapphires ______ than non-
basaltic saphhires. - ✔✔Darker
What is the trade name cosidered as the finest blue sapphire? -
✔✔Kashmir
A common sapphire characteristic - ✔✔Color zoning
Most sapphires are ______ to improve their appearance. - ✔✔Heat
treated
Fine quality, untreated sapphires make up ______ of the sapphire market. -
✔✔A small but extremely valuable segment
,What country buys about half of the blue sapphires on the world market? -
✔✔USA
Kashmir sapphires owe their reputation to a brief period of output during
what time period? - ✔✔1880s
What country is a major center of the corrundum trade, funneling a steady
flow of gems from worldwide sources into the consumer market? -
✔✔Thailand
What country is the world's largest source of dark blue, commercial quality
blue sapphires? - ✔✔Australia
What country has become a significant source of good to fine qualtiy blue
sapphires? - ✔✔Madagascar
The most common sapphire synthesis method - ✔✔Flame fusion
Milky, greyish, or brownish corundum that can be treated to a fine blue
color - ✔✔Geuda
Color of fine blue sapphire - ✔✔Blue to violetish blue
Blue sapphires that orginate in basaltic rock generally have a... -
✔✔Higher iron content
Finer quality Kashmir blue sapphires typically show what type of
appearance? - ✔✔Velvety
,"Inky" sapphires generally originate from... - ✔✔Australia
Most fine sapphires over 100 cts. come from what country? - ✔✔Sri
Lanka
What country emerged in the 1990s as a significant source of fine to good
quality saphhire? - ✔✔Madagascar
What country is the world's largest blue saphhire exporter? -
✔✔Thailand
The sapphire market level supplied by Switzerland is - ✔✔Upper
When did Madagascar become a significant source of blue sapphire? -
✔✔1990s
What location supplies sapphires that are most likely not heat-treated? -
✔✔Yogo Gulch
A Kashmir sapphire's blue is also known as - ✔✔Cornflower blue
A Burmese sapphire's blue is known as ______ blue and is considered
somewhat _______. - ✔✔Royal; inky
The "Ceylon" or "Sri Lanka" sapphire's saturation is ______ and ______.
The tone is ______ to ______. - ✔✔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. - ✔✔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) - ✔✔Blue to greenish blue color
Light to dark tone
"Thai" sapphires are ______ to ______ in color and often described as
______ or _______. - ✔✔Violetish blue to slightly greenish blue
Inky blue or blue-black
Australian sapphires often show ______ plechroism. - ✔✔Strong
greenish blue
Lapiz Lazuli is value for its ______ and rich ______ color. - ✔✔History;
blue
What produces lapis lazuli's prized royal blue color? - ✔✔Lazurite
Lapiz lazuli's value is based on color and the presence or absence of
______ or ______. - ✔✔Calcite or pyrite
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