Exam (elaborations)
GIA Colored Stones Assignment 4 (questions and answers)
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GIA Colored Stones Assignment 4 (questions and answers)
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GIA ColoredStones
Assignment 4
(questions and
answers)
This is the most important factor in determining a
colored gemstone's desirability, marketability, and
value. - answer Color
This is a form of energy that travels in waves. -
answer Light
Most gem color is caused by... - answer selective
absorption
Selective absorption is influenced by... - answer
chemical composition and crystal structure
,Some colored gems can be identified by the way
they absorb... - answer visible light
Because of differences in crystal structure, the
same ____________________ can cause different colors
in different gems. - answer transition element
What causes the most desirable red and green gem
colors? - answer Chromium
What transition element causes a greater variety
of gem colors than any other transition element? -
answer iron
What is responsible for most blue and yellow gem
colors? - answer Charge transfer
What can alter or initiate some color-causing
charge transfer reactions? - answer treatment
Without exposure to natural or artificial
____________, color centers can't cause color in gems.
- answer radiation
, Only _________________ gems can be pleochroic. -
answer doubly refractive
What produces either darkness of the brightening
of one or more colors? - answer interference
Opal's play-of-color is produced by the interaction
of light with the gem's microscopic internal
structure of stacked ________________. - answer
silica spheres
What reflecting from inclusions causes several
phenomenal effects in gems? - answer light
A pattern of dark vertical lines or bands shown by
certain gems when viewed through a spectroscope.
- answer absorption spectrum
The cloudy bluish white light in a moonstone,
caused by scattering of light. - answer
adularescence
A gem colored by trace elements in its crystal
structure. - answer allochromatic
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