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Colored Stones Final Exam.
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Colored Stones Final Exam.
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Colored Stones Final Exam"Inky" sapphires generally originate from... - ANS-Australia
"Thai" sapphires are ______ to ______ in color and often described as ______ or
_______. - ANS-Violetish blue to slightly greenish blue
Inky blue or blue-black
11. The color change in alexandrite is caused by - ANS-Slight impurities in Chromium
14. The hydrothermal synthetic process requires a - ANS-Pressurized steel container
and crushed chemical ingredients.
2 countries that account for 75% of emerald purchases worldwide - ANS-US and Japan
2 methods used to synthesize emeralds - ANS-1. Flux
2. Hydrothermal
2 through 8 - ANS-
21. Pearls-Hank - ANS-A number of similar cultured pearl strands bundled together
3 treatments used with lapis - ANS-1. dyed
2. impregnated with wax or plastic
3. heated then dyed
7. The type of matrix found as a layer in finished boulder opal is - ANS-Ironstone
A Burmese sapphire's blue is known as ______ blue and is considered somewhat
_______. - ANS-Royal; inky
A characteristic or irregularity confined to the surface of a polished gemstone is a(n) -
ANS-Blemish
A common sapphire characteristic - ANS-Color zoning
A cryptocrystalline quartz aggregate - ANS-Chalcedony
A crystal growth habit with bumpy appearance
,(similar to a bunch of grapes) - ANS-Botryodal
A gem produced by, or derived from, a living organism is - ANS-Organic.
A Kashmir sapphire's blue is also known as - ANS-Cornflower blue
A laboratory-created gem with essentially the same chemical composition, crystal
structure, and properties as its natural counterpart is a(n) - ANS-Synthetic.
A large - ANS-unhealed feather
A new turquoise treatment that appeared in the 1980s and has been used to treat 10
million+ cts - ANS-Zachary method
A property of some xtls that causes them to vibrate at a constant frequency when
subjected to an electrical current - ANS-Piezolectricity
A smokey corundum that turns blue when treated - ANS-Dhun
A snakeskin structural pattern is typical of - ANS-Synthetic opal.
A substance that consists of atoms of only one kind - ANS-Chemical element
A table-cut gem with a flat or slightly domed top and sometimes a carved design,
typically set in men's rings and cufflinks - ANS-Signet
A transparent quartz, usually rock xtl, that contains eye-visible inclusions, often named
according to the type of inclusions it contains - ANS-Sagenitic
A two-phase inclusion is a cavity in a gem that's typically filled with - ANS-A liquid and a
gas.
A type of sagenitic quartz containing ndl-like rutile inclusions - ANS-Rutilated quartz
A type of sagentic quartz contaiing ndl-like or rod-like tourmaline inclusions -
ANS-Tourmalated quartz
A unit cell defines a mineral's - ANS-Basic identity.
,Absorption spectrum. - ANS-The pattern of dark lines or bands shown by certain
colored gems when viewed through a spectroscope.
Adularescence is caused by - ANS-scattering of light
Adularescence is caused by - ANS-Scattering of light.
After irradiation, which gem's color is stable under normal wearing conditions? -
ANS-Golden beryl
Amazonite is an imitation of what stone? - ANS-Turquoise
Are Spinels a good substitute for Tanzanite? - ANS-No, Spinels are singly refractive;
they don't show doubly, they can't show pleocroism.
Assignment 10 - ANS-
Assignment 11 - ANS-
Assignment 12 - ANS-
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, Assignment 23 - ANS-
Assignment 24 - ANS-
Assignment 25 - ANS-
Assignment 26 - ANS-
Assignment 27 - ANS-
Assignment 8 - ANS-
Assignment 9 - ANS-
Australian sapphires often show ______ plechroism. - ANS-Strong greenish blue
Black Pearl Bead Nucleus - ANS-Saltwater Cultured Pearls, gamma radiation darkens
bead nucleus not nacre
Blue sapphire's most common crystal habit is - ANS-A spindle-shaped hexagonal
pyramid or bipyramid
Blue sapphires that orginate in basaltic rock generally have a... - ANS-Higher iron
content
Body color of Moonstone - ANS-Colorless, finest quality is semitransparent to nearly
transparent appearance & vivid blue adularescene
Chalcedony with curved or angular bands or layers that differ in color and transparency
- ANS-Agate
Chalcedony with curved or irregular bands or layers that differ in color and transparency
- ANS-Agate
Charge transfer - ANS-The process where electrons that selectively absorb light are
passed back and forth between neighboring impurity ions
Chemical element - ANS-A substance that consists of atoms of only one kind
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