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GIA Colored Stones Assignment 12_ Ruby.
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GIA Colored Stones Assignment 12_ Ruby.
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GIA Colored Stones Assignment 4absorption spectrum - ANS-A pattern of dark vertical lines or bands shown by certain
gems when viewed through a spectroscope.
absorption spectrum - ANS-The pattern of dark lines or bands shown by certain colored
gems when viewed through a spectroscope is called...
adularescence - ANS-The cloudy bluish white light in a moonstone, caused by
scattering of light.
allochromatic - ANS-A gem colored by trace elements in its crystal structure.
aluminum - ANS-Which element does chromium substitute for to cause ruby's red?
asterism - ANS-Crossing of chatoyant bands, creating a star in the dome of a cabochon.
aventurescence - ANS-A glittery effect caused y light reflecting from small, flat
inclusions within a gemstone.
charge transfer - ANS-A process where the electrons that selectively absorb light are
passed back and forth between neighboring impurity ions.
charge transfer - ANS-The process where electrons that selectively absorb light are
passed back and forth between neighboring impurity ions is known as
___________________.
charge transfer - ANS-What is responsible for most blue and yellow gem colors?
chatoyancy - ANS-Bands of light in certain gems, caused by reflection of light from
many parallel, needle-like inclusions or hollow tubes.
chemical composition and crystal structure - ANS-Selective absorption is influenced
by... (2)
chromium - ANS-What causes the most desirable red and green gem colors?
chromium - ANS-Which element causes the finest reds and greens in gemstones?
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