Velvety blue to violetish blue, in medium to medium-dark tones, with strong to vivid
saturation️️Fine sapphire
What trace elements cause the blue of sapphire?️️Iron and titanium
A smokey corundum that turns blue when treated️️Dhun
Higher levels of iron make basalt-hosted sapphires _...
Colored Stones Final Exam with comprehensive questions and
answers 2024/2025
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
3 treatments used with lapis✔️✔️1. dyed
2. impregnated with wax or plastic
3. heated then dyed
What country is the major source for lapis lazuli?✔️✔️Afghanistan
The lapis lazuli trade grade that's often spotted with green and shows obvious calcite
is✔️✔️Chilean
The finest color of turquoise is✔️✔️Intense medium blue
The purest blue colors of turquoise are caused by✔️✔️Copper
The trade term for top-color turquoise✔️✔️Persian
Turquoise usually forms in✔️✔️Limonite
What is the color of the markings that sandstone matrix creates in turquoise?✔️✔️Tan
Stabalized turquoise is a trade term for✔️✔️Polymer-impregnated turquoise
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