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Assignment 4-GIA Colored Stones; Questions and Answers 100% Verified
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Assignment 4-GIA Colored Stones; Questions and Answers 100% Verified
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Assignment 4-GIA Colored Stones; Questions andAnswers 100% Verified
color Correct-This is the most important factor in determining a colored gemstone's
desirability, marketability, and value.
light Correct-This is a form of energy that travels in waves.
selective absorption Correct-Most gem color is caused by...
chemical composition and crystal structure Correct-Selective absorption is influenced by...
(2)
visible light Correct-Some colored gems can be identified by the way they absorb...
trasition element Correct-Because of differences in crystal structure, the same
____________________ can cause different colors in different gems.
chromium Correct-What causes the most desirable red and green gem colors?
, Assignment 4-GIA Colored Stones; Questions and
Answers 100% Verified
iron Correct-What transition element causes a greater variety of gem colors than any other
transition element?
charge transfer Correct-What is responsible for most blue and yellow gem colors?
treatment Correct-What can alter or initiate some color-causing charge transfer reactions?
radiation Correct-Without exposure to natural or artificial ____________, color centers
can't cause color in gems.
doubly refractive Correct-Only _________________ gems can be pleochroic.
interference Correct-What produces either darkness of the brightening of one or more
colors?
silica spheres Correct-Opal's play-of-color is produced by the interaction of light with the
gem's microscopic internal structure of stacked ________________.
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