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GIA DIAMONDS AND DIAMOND GRADING
FINAL EXAM NEWEST ACTUAL EXAM
COMPLETE 186 QUESTIONS AND CORRECT
DETAILED ANSWERS
How are gem-quality rough diamonds sorted?
Correct answer: Shape
Explanation: Rough diamonds are sorted by shape (e.g.,
octahedral, cubic) to determine cutting potential and value.
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What is a downstream segment of the mine-to-market diamond journey?
Correct answer: Jewelry retail
Explanation: Jewelry retail is the final stage where polished
diamonds are sold to consumers.
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What describes a larger organization buying and joining smaller companies?
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Correct answer: Consolidation
Explanation: Consolidation involves merging smaller entities
into a larger one, common in the diamond industry.
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What region was the heart of the diamond rush in South Africa?
Correct answer: Kimberley
Explanation: The 1860s diamond rush centered in Kimberley,
leading to major mining operations.
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What diamond's discovery led to the modern diamond industry?
Correct answer: Star of South Africa
Explanation: Found in 1869, this 83.50-ct rough diamond
sparked the South African diamond boom.
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What is characteristic of minerals?
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Correct answer: Chemical composition
Explanation: Minerals are defined by a specific chemical
composition and crystalline structure.
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What layer is molten?
Correct answer: Outer core
Explanation: The Earth’s outer core is a molten layer of iron and
nickel, unlike the solid inner core.
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Where are most diamond deposits found?
Correct answer: Cratons
Explanation: Cratons, stable ancient continental crust, host most
diamond-bearing kimberlite pipes.
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Where do most diamonds form and reside?
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Correct answer: Mantle keels
Explanation: Diamonds form in the mantle keels beneath
cratons, at depths of 150-200 km.
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What is an example of a superdeep diamond?
Correct answer: Juína
Explanation: Juína diamonds from Brazil are sourced from
depths exceeding 400 km.
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What kind of rock creates a primary diamond deposit?
Correct answer: Kimberlite
Explanation: Kimberlite, a volcanic rock, transports diamonds
from the mantle to the surface.
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How do geologists locate cratons?