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Assignment 3-GIA Colored Stones; Questions and Answers
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Assignment 3-GIA Colored Stones; Questions and Answers
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Assignment 3-GIA Colored Stones; Questions andAnswers
crystalline minerals Correct-what are classified into seven crystal systems, depending on
the symmetry of their unit cells?
exterior shape Correct-what part of a crystal often indicates its symmetry at an atomic
level?
rare Correct-What do you call gems that require rare chemical elements or unique
geological conditions, or both, to form?
twinning Correct-What can result form a change during crystal growth, or from cooling or
pressure after the crystal has grown?
inclusions Correct-What can help identify a colored stone as natural or manmade,
untreated or treated?
large inclusions Correct-What can dramatically affect beauty, value, and durability?
, Assignment 3-GIA Colored Stones; Questions and
Answers
identify them Correct-What can a gemstone's recognizable crystal shape help do?
finished stones Correct-The shapes and sizes of rough gem crystals affect the shapes and
sizes of...
gem density and specific gravity Correct-What two things depend on the types of atoms a
gem is made of, and how closely they're packed together?
cleavage, parting, and fracture Correct-The three different ways a gem breaks are called...
reaction to external stress Correct-A gem's crystal structure determines its...
aggregate Correct-A mass of tiny, randomly oriented crystals.
cleavage Correct-A smooth, flat break in a gemstone parallel to planes of atomic
weakness, caused by weak or fewer bonds between atoms, or both.
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