GIA Final Exam Colored Stones Questions and Answers (Graded A+)
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Course
GIA
Institution
GIA
tree resin hardened over time up to 1000 years - ANSWER - amber
inmature amber - ANSWER - copal
most valuable amber - ANSWER - transparent red
cause amber color change over time - ANSWER - oxidation
circular marks sometimes left in amber when heat and oil it - ANSWER - sun spangles
c...
GIA Final Exam Colored Stones
Questions and Answers
(Graded A+)
tree resin hardened over time up to 1000 years - ANSWER - amber
inmature amber - ANSWER - copal
most valuable amber - ANSWER - transparent red
cause amber color change over time - ANSWER - oxidation
circular marks sometimes left in amber when heat and oil it - ANSWER - sun
spangles
coral most valuable color - ANSWER - intense red
color of conchiolin coral - ANSWER - black and gold
most valuable ivory - ANSWER - elephant tusks
ornamental form of lignite coal - ANSWER - jet
major jet source - ANSWER - England
Most of the gems in Tanzania's Umba River Valley are found in - ANSWER - placer
deposits
,From granite, pegmatite gems get exotic elements like - ANSWER - beryllium, boron,
and lithium.
Adularescence is caused by - ANSWER - scattering of light
A broad gem category based on chemical composition and crystal structure is a -
ANSWER - gem species.
Kunzite is most often found in association with - ANSWER - tourmaline and beryl in
pegmatite.
Which phenomenon is a broad color flash - ANSWER - labradorescence
The pattern of dark vertical lines or bands shown by certain gems when viewed
through a spectroscope is called - ANSWER - absorption spectrum
The process where electrons that selectively absorb light are passed back and forth
between neighboring impurity ions is known as - ANSWER - charge transfer.
Which gem can show three pleochroic colors - ANSWER - Like tanzanite and
andalusite, iolite can show three pleochroic colors.
Which process uses a heating unit that passes over a rotating solid rod of chemicals
until it forms a synthetic crystal? - ANSWER - Floating zone
The two main types of processes for synthetic gem production are melt and -
ANSWER - solution
A snakeskin structural pattern is typical of - ANSWER - synthetic opal.
Which synthetic process uses an autoclave - ANSWER - Hydrothermal growth
, The flux used in the flux process is a solid material that, when molten, - ANSWER -
dissolves other materials.
Which process dissolves nutrients in chemicals to form synthetic crystals? - ANSWER
- Flux growth
Which synthetic process developed rapidly due to laser research in the 1960 -
ANSWER - pulling
Synthetic opal is grown using microscopic silica spheres that are produced by -
ANSWER - precipitation
The hydrothermal growth process is the only method used to produce which
synthetic gem? - ANSWER – Quartz
Heat and pressure transform limestone into - ANSWER - marble
A natural, inorganic substance with a characteristic chemical composition and
usually characteristic crystal structure is a(n) - ANSWER - mineral
Which of the following is a gem variety - ANSWER - demantoid
A substance that consists of atoms of only one kind is a - ANSWER - Chemicals
element
Myanmar's famous Mogok ruby deposits were formed by - ANSWER - metamorphic
processes.
Which type of twinning looks as if two crystal halves are mirror images - ANSWER -
Contact
Which type of twinning is caused by environmental change after the gem forms -
ANSWER - Polysynthetic
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