Colored Stones Final Exam with Complete Questions and Answers (Graded A)
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Colored Stones
Colored Stones Final Exam with Complete Questions and Answers (Graded A)Colored Stones Final Exam with Complete Questions and Answers (Graded A)Colored Stones Final Exam with Complete Questions and Answers (Graded A)Colored Stones Final Exam with Complete Questions and Answers (Graded A)
Velvety b...
Colored Stones Final Exam with
Complete Questions and
Answers (Graded A)
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
,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
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.
What type of crystalline has the smallest xtl size? - ANSWER - Cryptocrystalline
, In the 19th century, a major source of amethyst was discovered in what country? -
ANSWER - Brazil
The color of amethyst results from - ANSWER - Color centers acting on iron
(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
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
The lapis lazuli trade grade that's often spotted with green and shows obvious
calcite is - ANSWER - Chilean
The finest color of turquoise is - ANSWER - Intense medium blue
The purest blue colors of turquoise are caused by - ANSWER - Copper
The trade term for top-color turquoise - ANSWER - Persian
Turquoise usually forms in - ANSWER - Limonite
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