GIA Colored Stones Assignment 21:
Tanzanite, Iolite, Chrysoberyl, and
Andalusite EXAM
|Questions Solved 100% Correct|
Verified Answers
Iolites with a predominantly _________ face-up color are more valuable, so cutters orient the
finished stones to display the desirable color. - ANSWER blue
Iolite can be an affordable alternative to tanzanite because in comparable quality, it sells
for about ______-__________ the price. - ANSWER one-tenth
______________ ______________ is the finest color-change gem, and the standard against
which all other color-change gems are judged. - ANSWER alexandrite chysoberyl
Traces of ______________ cause alexandrite's color change. - ANSWER chromium
_________ ________________ is green to bluish green in daylight or fluorescent light and red
to purplish red in incandescent light, with medium to medium-dark tone and moderately strong
saturation. - ANSWER fine alexandrite
Although Russian alexandrite mines produce little today, the rare and vivid hues of
Russian alexandrite still set the _____________ for fine color. - ANSWER standard
A large deposit of alexandrite discovered in _____________ in the early 1980's briefly increased
alexandrite's availability. - ANSWER Brazil
, Currently, fine alexandrite is so scarce that it has virtually disappeared from the marketplace
except as an expensive __________________ ________. - ANSWER collector's gem
Excellent hardness and durability combined with the sharpest cat's-eye make
_______________ the most-prized chatoyant gem. - ANSWER chryosoberyl
Cat's-eye chrysoberyl's chatoyancy is caught by __________ _____________ from fine needle-
like inclusions within the gemstone. - ANSWER light reflecting
Because it withstands rough wear and is subtly colored, cat's-eye is traditionally marketed as a
_________ ______. - ANSWER man's gem
Andalusite's pleochroism is so pronounced that its hues are often visible
___________________ through the gem's crown, creating a mosaic effect. - ANSWER
simultaneously
Alexandrite was discovered in ________. - ANSWER 1830
The name tanzanite was given to transparent blue zoisite by... - ANSWER Tiffany & Co.
The most-prized chatoyant gem in the world is... - ANSWER cat's-eye chrysoberyl
The color change in alexandrite is caused by.... - ANSWER chromium
Strongly saturated blue or violetish blue is _______________ _________ __________. -
ANSWER tanzanite's best color
Almost all tanzanite is... - ANSWER heat-treated
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