GIA Diamonds and Diamond Grading Final Exam (2024/2025) Questions with Correct Detailed Solutions Already Graded A+ <Latest Version>
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GIA Diamonds and Diamond Grading
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GIA Diamonds And Diamond Grading
GIA Diamonds and Diamond Grading
Final Exam (2024/2025) Questions with
Correct Detailed Solutions
Already Graded A+ <Latest Version>
What does 'HPHT' production of lab-grown diamonds require? - ANSWER
Carbon source, heating element, metal catalyst, seed crystal, temperature gradient
W...
GIA Diamonds and Diamond Grading
Final Exam (2024/2025) Questions with
Correct Detailed Solutions
Already Graded A+ <Latest Version>
What does 'HPHT' production of lab-grown diamonds require? - ANSWER ✔
Carbon source, heating element, metal catalyst, seed crystal, temperature gradient
Where are CVD diamonds grown? - ANSWER ✔ In a heated mixture of
hydrocarbon gas and excess hydrogen gas
What shape can metallic inclusions takes in HPHT diamond? - ANSWER ✔
Feather and chips / rounded, elongated, or irregularly shaped
How do gemological laboratories report a drill hole? - ANSWER ✔ clarity
characteristic
How does the refractive index (RI) of a fracture filling compare to diamonds? -
ANSWER ✔ Similar
How does HPHT processing of type II diamonds enhance bodycolor? - ANSWER
✔ Become near-colorless to colorless / D-H
What is the best course of action when unsure if a diamond is natural or treated? -
ANSWER ✔ Send it to a gemological laboratory
Why can diamond color differ as a result of irradiation? - ANSWER ✔ The
defects already present, heating can also change color
What feature can a colorless diamond and a simulant have in common? -
ANSWER ✔ No simulant mimics all of diamonds features
, what was a popular simulant in the 1990s? - ANSWER ✔ Natural colorless
sapphire
What are carved into a simlant's girdle to mimic bruting? - ANSWER ✔ Striations
What was one of the first assembled simulants in jewelry? - ANSWER ✔ Garnet
and glass double
What is heft? - ANSWER ✔ Size in contrast to weight
What is the most important consideration for matching diamonds 0.01ct or less? -
ANSWER ✔ Making sure they are all the same size
What tool provides precise measurements? - ANSWER ✔ Millimeter Gauge
How is diamond inventory organized and stored? - ANSWER ✔ Stone papers
What component allows light to enter a DiamondView? - ANSWER ✔ Aperture
What is the primary benefit of photoluminescence mapping? - ANSWER ✔
Portrays defect concentrations
What provenance might increase price for a diamond? - ANSWER ✔ Owned by a
movie star?
What is the price of a 0.55ct diamond with a per-carat price of $7,200? -
ANSWER ✔ $3,960
What is the total price of a parcel? - ANSWER ✔ Depends on contents and their
specs
What lab-grown diamond pricing model is based on cost? - ANSWER ✔ Cost-
plus
What best helps develop trading partners? - ANSWER ✔ Networking event
, What does spherical aberration cause? - ANSWER ✔ Linear distortion at lens
edge
What clarity characteristics is found entirely within a diamond? - ANSWER ✔
Inclusion
What is the abbreviation for an inclusion that is an result of crystal distortion
during growth? - ANSWER ✔ TW (twinning wisp)
What clarity characteristic can indicate an efficient cut? - ANSWER ✔ A natural
(N)
What magnification is used to assess clarity characteristics' visibility? - ANSWER
✔ 10x
What clarity grade might result from tiny inclusions very difficult to see at 10x
magnifications? - ANSWER ✔ VVS1 or VVS2
What clarity grade has obvious inclusions at 10x magnifications? - ANSWER ✔
I1, I2, or I3
What type of clarity characteristics determine the clarity grade of a dimaond? -
ANSWER ✔ Grade-setting
What characteristics are drawn only in green on a plot? - ANSWER ✔ Blemishes
What is a term that describes tone? - ANSWER ✔ Degree of darkness; lightness
of a color
What color becomes more prominent as warm hues become less saturated? -
ANSWER ✔ Brown
What term falls on the GIA D-Z color scale? - ANSWER ✔ Colorless, near-
colorless, faint, very light, light
What is the correlation between a mastertone and the grade it represents? -
ANSWER ✔ Universal standard, maintains consistency
, Why must a diamond be re-examined under magnification after color grading? -
ANSWER ✔ Confirm identity
What diamond size makes it easiest to see subtle color? - 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 - ANSWER ✔ Average girdle diameter
How many crown angles on a round brilliant diamond should be estimated before
averaging? - ANSWER ✔ 8
What may result from a thick, unpolished girdle? - ANSWER ✔ Grey, reflection
on the stone
How is a diamond positioned to estimate the lower half facet length percentage? -
ANSWER ✔ Face up position
Why do diamonds with steep crowns offer less vaule? - ANSWER ✔ Look
smaller face-up than weight suggest
What describes the polish quality and cut precision of a diamond? - ANSWER ✔
Craftmanship
What proportion greatly influences brightness in a round brilliant diamonds? -
ANSWER ✔ Table percentage
How do steep pavilion angles affect appearance? - ANSWER ✔ Produce dark
areas under the table
What parameters is measured at the belly of an oval? - ANSWER ✔ Width
What are the clarity fractors used for grading fancy cuts? - ANSWER ✔ Size,
number, location, relief, nature
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