GIA Diamond and Diamond Grading Final
Exam Questions And Answers 100% 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
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
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
What happens to light rays outside the critical angle cone? - answer✔Reflect interally
What did cutters apply the modern brilliant cut to fancy shapes? - answer✔to maximize profit
from oddly shaped or off color
How does laser sawing increase weight retention? - answer✔They are computerized, so they
are quicker and more precise. "Pie or Scoop sawing". That will save the weight retention
What early cut introduced the culet? - answer✔table cut
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