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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Name: Score:56 Multiple choice questions
Definition 1 of 56
What is the only type of gem that can show pleochroism?
singly refractive
doubly refractive
faceted
diamond simulant
Definition 2 of 56
Change in speed and possible change in direction of light as it travels from one material to
another.
refraction
asterism
iron
convection
Definition 3 of 56
Which element causes the finest reds and greens in gemstones?
cobalt
chromium
vanadium
aluminum
,Definition 4 of 56
Which components of a transition element's atoms can produce color in gems?
protons
light
neutrons
electrons
Definition 5 of 56
Which element causes the color of both almandine and peridot?
iron
nitrogen
oxygen
aluminum
Definition 6 of 56
What produces either darkness of the brightening of one or more colors?
iridescence
asterism
treatment
interference
Definition 7 of 56
What transition element causes a greater variety of gem colors than any other transition
element?
iron
aluminum
nitrogen
oxygen
,Definition 8 of 56
When a gem's crystal structure doesn't change incoming light other than by refraction and and
absorption.
double refraction
interference
diffraction
single refraction
Definition 9 of 56
A gem colored by trace elements in its crystal structure.
allochromatic
pleochroism
chatoyancy
nesosilicate
Definition 10 of 56
When a gem's crystal structure splits light into two rays that each travel at a slightly different
speed and direction, it's called ____________________.
double refraction
single reflection
triple diffraction
polarized absorption
, Definition 11 of 56
A process where the electrons that selectively absorb light are passed back and forth
between neighboring impurity ions.
interference
charge transfer
absorption spectrum
electrons
Definition 12 of 56
A broad flash of color in labradorite feldspar that disappears when the gem is moved.
fluorescence
adularescence
iridescence
labradorescence
Definition 13 of 56
What can alter or initiate some color-causing charge transfer reactions?
diffraction
independent variable
correlation
treatment
Definition 14 of 56
Which transition element causes a greater variety of gem colors than any other?
aluminum
oxygen
nitrogen
iron
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