1|Pag e
GIA DIAMONDS AND DIAMOND GRADING FINAL
EXAM 2025 || ACTUAL EXAM 2025 ALL QUESTIONS
AND 100% CORRECT ANSWERS GRADED A+||
LATEST AND COMPLETE UPDATE 2025 WITH
VERIFIED SOLUTIONS|| ASSURED PASS!!
How are gem-quality rough diamonds sorted? - ANSWER: weight, shape, clarity,
and color
What is a downstream segment of the mine to market diamond journey? -
ANSWER: Selling to a customer via diamond jewelry retail
What describes a larger organization buying and joining smaller companies? -
ANSWER: Consolidation
What region was the heart of the diamond rush in South Africa? - ANSWER:
Kimberly
What diamond's discovery led to the modern diamond industry? - ANSWER: The
Dudley- star of South Africa
What is characteristic of minerals? - ANSWER: Natural inorganic substance with
chemical composition and characteristic structure
What layer is molten? - ANSWER: Outer core
Where are most diamond deposits found? - ANSWER: Cratons
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Where do most diamonds form and reside? - ANSWER: Within the mantel keel
under cratons
What is an example of a superdeep diamond? - ANSWER: Juina
What kind of rock creates a primary diamond deposit? - ANSWER: Kimberlite
How do geologists locate cratons? - ANSWER: geological mapping
How does ore removal start in a primary deposit? - ANSWER: Open-pit mining
What might perovskite in a mineral sample indicate? - ANSWER: A diamond
pipe/source deposit is nearby
What is the rock that covers a pipe? - ANSWER: overburden - also called yellow
ground due to yellow color
Which subatomic particle has no electrical charge? - ANSWER: Neutron
What can the diamond type classification system help to identify? - ANSWER:
Lab-grown diamonds
What is another name for the cubic system? - ANSWER: Isometric
What is the surface in a twinned crystal where the diamond's growth direction
changes? - ANSWER: Twinning plane
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What is a rough diamond's value based on? - ANSWER: Facet gem potential
What type of radiant energy is found on the electromagnetic spectrum? -
ANSWER: X-ray
What causes steps in a diamond's band gap? - ANSWER: A constant energy
differences. How much energy an electron requires to move across the gap
What do electrons do when visible light is emitted during luminescence? -
ANSWER: Return to stable state
What subatomic particles interact with light to produce color? - ANSWER:
Electrons
What does irradiation create when it displaces carbon atoms in the crystal lattice? -
ANSWER: Vacancies
What is refraction? - ANSWER: The change in speed and possible change in
direction of light as it travels from one material to another
What is fire in a polished diamond? - ANSWER: Dispersion
What is a key component of cut quality in a polished diamond? - ANSWER:
Proportion
What is essential for consistent diamond cut grading? - ANSWER: Spot and
diffused fluorescent lighting
GIA DIAMONDS AND DIAMOND GRADING FINAL
EXAM 2025 || ACTUAL EXAM 2025 ALL QUESTIONS
AND 100% CORRECT ANSWERS GRADED A+||
LATEST AND COMPLETE UPDATE 2025 WITH
VERIFIED SOLUTIONS|| ASSURED PASS!!
How are gem-quality rough diamonds sorted? - ANSWER: weight, shape, clarity,
and color
What is a downstream segment of the mine to market diamond journey? -
ANSWER: Selling to a customer via diamond jewelry retail
What describes a larger organization buying and joining smaller companies? -
ANSWER: Consolidation
What region was the heart of the diamond rush in South Africa? - ANSWER:
Kimberly
What diamond's discovery led to the modern diamond industry? - ANSWER: The
Dudley- star of South Africa
What is characteristic of minerals? - ANSWER: Natural inorganic substance with
chemical composition and characteristic structure
What layer is molten? - ANSWER: Outer core
Where are most diamond deposits found? - ANSWER: Cratons
,2|Pag e
Where do most diamonds form and reside? - ANSWER: Within the mantel keel
under cratons
What is an example of a superdeep diamond? - ANSWER: Juina
What kind of rock creates a primary diamond deposit? - ANSWER: Kimberlite
How do geologists locate cratons? - ANSWER: geological mapping
How does ore removal start in a primary deposit? - ANSWER: Open-pit mining
What might perovskite in a mineral sample indicate? - ANSWER: A diamond
pipe/source deposit is nearby
What is the rock that covers a pipe? - ANSWER: overburden - also called yellow
ground due to yellow color
Which subatomic particle has no electrical charge? - ANSWER: Neutron
What can the diamond type classification system help to identify? - ANSWER:
Lab-grown diamonds
What is another name for the cubic system? - ANSWER: Isometric
What is the surface in a twinned crystal where the diamond's growth direction
changes? - ANSWER: Twinning plane
, 3|Pag e
What is a rough diamond's value based on? - ANSWER: Facet gem potential
What type of radiant energy is found on the electromagnetic spectrum? -
ANSWER: X-ray
What causes steps in a diamond's band gap? - ANSWER: A constant energy
differences. How much energy an electron requires to move across the gap
What do electrons do when visible light is emitted during luminescence? -
ANSWER: Return to stable state
What subatomic particles interact with light to produce color? - ANSWER:
Electrons
What does irradiation create when it displaces carbon atoms in the crystal lattice? -
ANSWER: Vacancies
What is refraction? - ANSWER: The change in speed and possible change in
direction of light as it travels from one material to another
What is fire in a polished diamond? - ANSWER: Dispersion
What is a key component of cut quality in a polished diamond? - ANSWER:
Proportion
What is essential for consistent diamond cut grading? - ANSWER: Spot and
diffused fluorescent lighting
