Exam (elaborations)
Colored Stones Chapter 24
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Colored Stones Chapter 24
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Colored Stones Chapter 24_____________ is colored by vanadium, and the best is vivid green, with medium to
medium-dark tone.
1-Tsavorite
2-andrite
3-shaphire - ANS-Tsavorite
_____________is the most rare and valuable spinel hue.
1-pink
2-Red
3-blue - ANS-Red
Because spinel is rare and _________________ is common, many people have never
seen the natural stone.
1-natural spinel
2-synthetic spinel
3-imitate spinel - ANS-synthetic spinel
Color-change garnets are usually_____________mixtures with vanadium as a coloring
agent.
1-pyrope-spessartite mixtures
2-pyrope-spessartite chemicals
3-pyrope-spessartite solutions - ANS-pyrope-spessartite mixtures
Demantoid comes mostly from sources in__________________________
1-Russia and China
2-Asia and Africa.
3-Russia and Africa. - ANS-Russia and Africa.
Demantoid, the transparent green variety of andradite, is colored by a mixture of
_____________________________
1-aluminum and iron.
2-boron and iron.
3-chromium and iron. - ANS-chromium and iron.
East Africa has been the most important source of rhodolite since the _____________
1-1950s.
2-1960s.
, 3-1970s. - ANS-1960s.
Garnet and spinel are __________ treated.
1-quickly
2-likely
3-rarely - ANS-rarely
Garnet and spinel are singly refractive, eliminating the need for cutters to consider
_____________________
1-shinning.
2-lusting.
3-pleochroism. - ANS-pleochroism.
Garnets belong to a group of minerals with the same crystal structure but slightly
different ___________________
1-chemical structure.
2-chemical composition.
3-chemical mixtures - ANS-chemical composition.
Gemologists classify garnets by their chemistry and their properties, but many dealers
sell garnets on the ___________________
1-basis of size or origin.
2-basis of shape or origin.
3-basis of color or origin. - ANS-basis of color or origin.
Hessonite is the ________________________________ of the grossularite species.
1-transparent yellow to cinnamon-colored species
2-transparent red to cinnamon-colored variety
3-transparent orange to cinnamon-colored variety - ANS-transparent orange to
cinnamon-colored variety
Hollowback
1-A step cut with a curved, undercut bottom, designed to lighten the tone of the gem
material.
2-A brilliant with a curved, undercut bottom, designed to lighten the tone of the gem
material.
3-A cabochon with a curved, undercut bottom, designed to lighten the tone of the gem
material. - ANS-A cabochon with a curved, undercut bottom, designed to lighten the
tone of the gem material.
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