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GIA DIAMONDS AND DIAMOND GRADING FINAL EXAM NEWEST
2025/2026 ACTUAL EXAM WITH COMPLETE QUESTIONS AND
CORRECT DETAILED ANSWERS (100% VERIFIED ANSWERS)
|ALREADY GRADED A+| ||PROFESSOR VERIFIED||
What trace element can cause a violet color in diamonds? -
ANSWER-Hydrogen-related defects
How does the energy emitted by a gem compare to the energy it
absorbs? - ANSWER-Lower
What type of light combines all the colors in the visible spectrum?
- ANSWER-White light
What is the most common cause of yellow color in diamonds? -
ANSWER-Nitrogen defects
What controls light path length within a diamond? - ANSWER-
Cutting
What term describes a gemstone's surface in reflected light? -
ANSWER-Luster
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What describes the flashes of spectral colors seen in a polished
diamond? - ANSWER-Fire
What was the main goal of research in developing the GIA Cut
Grading System? - ANSWER-Determine which proportion
combinations create the most attractive light performance
What best describes the angle of incidence? - ANSWER-
Measured btwn the normal and the reflected light
What process splits diamond rough along its cleavage plane? -
ANSWER-Cleaving
What do cutters evaluate to determine when to use a scaife for
coning? - ANSWER-Strain
What made true round-shaped diamonds possible? - ANSWER-
Bruting
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What was the prototype of the modern round brilliant cut? -
ANSWER-Old European cut
What does a dop do? - ANSWER-Holds/secures a diamond in
place
What does HPHT stand for? - ANSWER-High pressure, high
temperature
What rough form does NOT appear in natural diamonds -
ANSWER-Cuboctahedrons
What diamond type can be created by the HPHT method? -
ANSWER-Type 1b
What diamonds have strain pattern and intensity similar to natural
diamonds? - ANSWER-CVD lab-grown diamonds
When should the origin of a lab-grown diamond be disclosed? -
ANSWER-At every step
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What diamond clarity treatment expands inclusions? - ANSWER-
Internal laser drilling
What diamond color treatment further modifies color by allowing
vacancies and trace elements to diffuse post-irradiation? -
ANSWER-Annealing
What describes the formation of graphite around a diamond's
mineral inclusions and feathers? - ANSWER-Graphitization
What diamond clarity treatment relies on similar refractive index
(RI) values? - ANSWER-Fracture filling
How can HPHT treatment alter a diamond's color? - ANSWER-
HPHT treatment can move and rearrange defects in a diamonds
crystal lattice
What feature can a colorless diamond and a simulant have in
common? - ANSWER-Transparent
GIA DIAMONDS AND DIAMOND GRADING FINAL EXAM NEWEST
2025/2026 ACTUAL EXAM WITH COMPLETE QUESTIONS AND
CORRECT DETAILED ANSWERS (100% VERIFIED ANSWERS)
|ALREADY GRADED A+| ||PROFESSOR VERIFIED||
What trace element can cause a violet color in diamonds? -
ANSWER-Hydrogen-related defects
How does the energy emitted by a gem compare to the energy it
absorbs? - ANSWER-Lower
What type of light combines all the colors in the visible spectrum?
- ANSWER-White light
What is the most common cause of yellow color in diamonds? -
ANSWER-Nitrogen defects
What controls light path length within a diamond? - ANSWER-
Cutting
What term describes a gemstone's surface in reflected light? -
ANSWER-Luster
,2|Page
What describes the flashes of spectral colors seen in a polished
diamond? - ANSWER-Fire
What was the main goal of research in developing the GIA Cut
Grading System? - ANSWER-Determine which proportion
combinations create the most attractive light performance
What best describes the angle of incidence? - ANSWER-
Measured btwn the normal and the reflected light
What process splits diamond rough along its cleavage plane? -
ANSWER-Cleaving
What do cutters evaluate to determine when to use a scaife for
coning? - ANSWER-Strain
What made true round-shaped diamonds possible? - ANSWER-
Bruting
,3|Page
What was the prototype of the modern round brilliant cut? -
ANSWER-Old European cut
What does a dop do? - ANSWER-Holds/secures a diamond in
place
What does HPHT stand for? - ANSWER-High pressure, high
temperature
What rough form does NOT appear in natural diamonds -
ANSWER-Cuboctahedrons
What diamond type can be created by the HPHT method? -
ANSWER-Type 1b
What diamonds have strain pattern and intensity similar to natural
diamonds? - ANSWER-CVD lab-grown diamonds
When should the origin of a lab-grown diamond be disclosed? -
ANSWER-At every step
, 4|Page
What diamond clarity treatment expands inclusions? - ANSWER-
Internal laser drilling
What diamond color treatment further modifies color by allowing
vacancies and trace elements to diffuse post-irradiation? -
ANSWER-Annealing
What describes the formation of graphite around a diamond's
mineral inclusions and feathers? - ANSWER-Graphitization
What diamond clarity treatment relies on similar refractive index
(RI) values? - ANSWER-Fracture filling
How can HPHT treatment alter a diamond's color? - ANSWER-
HPHT treatment can move and rearrange defects in a diamonds
crystal lattice
What feature can a colorless diamond and a simulant have in
common? - ANSWER-Transparent
