GIA Diamond and Diamond Grading Final Exam New
2025 Version with Questions and 100% Correct
Answers
What is the best course of action when unsure if a diamond is natural or treated? -----------
Correct Answer ------------ Send it to a gemological laboratory
Why can diamond color differ as a result of irradiation? ----------- Correct Answer ------------ The
defects already present, heating can also change color
How are diamonds recovered? ----------- Correct Answer ------------ Sizing, concentrating, and
recovery
The use of lab-grown diamonds in jewelry --------- Correct Answer ------------ makes up a
substantial portion of the market.
The use of lab-grown diamonds in jewelry --------- Correct Answer ------------ makes up a
substantial portion of the market.
The origin of a diamond's color --------- Correct Answer ------------ should usually be determined
by a gemological laboratory.
Annealed diamond color can change if it's exposed to --------- Correct Answer ------------ heat
during routine repairs.
Color-treating diamonds in a linear accelerator produces --------- Correct Answer ------------ blue
or blue-green colors.
The origin of a diamond's color --------- Correct Answer ------------ should usually be determined
by a gemological laboratory.
Annealed diamond color can change if it's exposed to --------- Correct Answer ------------ heat
during routine repairs.
Color-treating diamonds in a linear accelerator produces --------- Correct Answer ------------ blue
or blue-green colors.
What is the name of the supercontinent that existed 230 million years ago? ----------- Correct
Answer ------------ Pangaea
What shadow like line are created by glide planes? ----------- Correct Answer ------------ Graining
What is the study of the interaction between matter and light? ----------- Correct Answer ----------
-- Spectroscopy
,What feature can a colorless diamond and a simulant have in common? ----------- Correct
Answer ------------ No simulant mimics all of diamonds features
what was a popular simulant in the 1990s? ----------- Correct Answer ------------ Natural colorless
sapphire
What are carved into a simlant's girdle to mimic bruting? ----------- Correct Answer ------------
Striations
What was one of the first assembled simulants in jewelry? ----------- Correct Answer ------------
Garnet and glass double
What is heft? ----------- Correct Answer ------------ Size in contrast to weight
What is the most important consideration for matching diamonds 0.01ct or less? -----------
Correct Answer ------------ Making sure they are all the same size
How is diamond inventory organized and stored? ----------- Correct Answer ------------ Stone
papers
What component allows light to enter a DiamondView? ----------- Correct Answer ------------
Aperture
What is the primary benefit of photoluminescence mapping? ----------- Correct Answer -----------
- Portrays defect concentrations
What provenance might increase price for a diamond? ----------- Correct Answer ------------
Owned by a movie star?
What is the price of a 0.55ct diamond with a per-carat price of $7,200? ----------- Correct Answer
------------ $3,960
What is the total price of a parcel? ----------- Correct Answer ------------ Depends on contents and
their specs
What lab-grown diamond pricing model is based on cost? ----------- Correct Answer ------------
Cost-plus
What best helps develop trading partners? ----------- Correct Answer ------------ Networking
event
What does spherical aberration cause? ----------- Correct Answer ------------ Linear distortion at
,lens edge
What clarity characteristics is found entirely within a diamond? ----------- Correct Answer --------
---- Inclusion
What is the abbreviation for an inclusion that is an result of crystal distortion during growth? ----
------- Correct Answer ------------ TW (twinning wisp)
What clarity characteristic can indicate an efficient cut? ----------- Correct Answer ------------ A
natural (N)
What magnification is used to assess clarity characteristics' visibility? ----------- Correct Answer -
----------- 10x
What clarity grade might result from tiny inclusions very difficult to see at 10x magnifications? -
---------- Correct Answer ------------ VVS1 or VVS2
What clarity grade has obvious inclusions at 10x magnifications? ----------- Correct Answer ------
------ I1, I2, or I3
What type of clarity characteristics determine the clarity grade of a dimaond? ----------- Correct
Answer ------------ Grade-setting
What characteristics are drawn only in green on a plot? ----------- Correct Answer ------------
Blemishes
What is a term that describes tone? ----------- Correct Answer ------------ Degree of darkness;
lightness of a color
What color becomes more prominent as warm hues become less saturated? ----------- Correct
Answer ------------ Brown
What term falls on the GIA D-Z color scale? ----------- Correct Answer ------------ Colorless,
near-colorless, faint, very light, light
What is the correlation between a mastertone and the grade it represents? ----------- Correct
Answer ------------ Universal standard, maintains consistency
Why must a diamond be re-examined under magnification after color grading? ----------- Correct
Answer ------------ Confirm identity
What diamond size makes it easiest to see subtle color? ----------- Correct Answer ------------ The
larger the diamond, the easiest it is to see color
What results from averaging the sum of the smallest and largest diameters of a round brilliant ----
------- Correct Answer ------------ Average girdle diameter
, How many crown angles on a round brilliant diamond should be estimated before averaging? ----
------- Correct Answer ------------ 8
What may result from a thick, unpolished girdle? ----------- Correct Answer ------------ Grey,
reflection on the stone
How is a diamond positioned to estimate the lower half facet length percentage? -----------
Correct Answer ------------ Face up position
Why do diamonds with steep crowns offer less vaule? ----------- Correct Answer ------------ Look
smaller face-up than weight suggest
What describes the polish quality and cut precision of a diamond? ----------- Correct Answer -----
------- Craftmanship
What proportion greatly influences brightness in a round brilliant diamonds? ----------- Correct
Answer ------------ Table percentage
How do steep pavilion angles affect appearance? ----------- Correct Answer ------------ Produce
dark areas under the table
How are gem-quality rough diamonds sorted? ----------- Correct Answer ------------ weight,
shape, clarity, and color
What is a downstream segment of the mine to market diamond journey? ----------- Correct
Answer ------------ Selling to a customer via diamond jewelry retail
What describes a larger organization buying and joining smaller companies? ----------- Correct
Answer ------------ Consolidation
What region was the heart of the diamond rush in South Africa? ----------- Correct Answer -------
----- Kimberly
What diamond's discovery led to the modern diamond industry? ----------- Correct Answer -------
----- The Dudley- star of South Africa
What is characteristic of minerals? ----------- Correct Answer ------------ Natural inorganic
substance with chemical composition and characteristic structure
What layer is molten? ----------- Correct Answer ------------ Outer core
Where are most diamond deposits found? ----------- Correct Answer ------------ Cratons
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