1|Page
GIA Diamonds and Diamond Grading Final Exam||
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+||NEWEST
VERSION!!!
What pavilion depth percentage might reflect the girdle
face-up through the table? - ANSWER-37%
Why do diamonds with thick girdles offer less value? -
ANSWER-Paying for more weight than you see
What might be found in a diamond with misalignment
(Aln)? - ANSWER-Misshapen facets
How do shallow pavilion angles affect appearance? -
ANSWER-Make it look foggy
What style describes a diamond that has both brilliant-cut
and step-cut facets? - ANSWER-Mixed cut
What is the area between the head and belly of an oval? -
ANSWER-Shoulders
,2|Page
What is used for total depth percentage calculation in
fancy shapes? - ANSWER-Width of stone (instead of
average girdle diameter)
Why is there no single cut grading standard for fancy
cuts? - ANSWER-Too many variations
What style helps avoid point breakage in fancy cuts? -
ANSWER-French tip
What is the length-to-width ratio for a fancy cut 4.00mm
long and 2.00mm wide? - ANSWER-2:1
How do diamond professionals estimate the weight of
mounted diamonds? - ANSWER-Mathematical formulas
What do appraisers assign to larger mounted diamonds
when color grading? - ANSWER-Single grade
What term describes a diamond whose clarity can become
VVS after repolishing? - ANSWER-Improvable
,3|Page
What is a good case for recutting? - ANSWER-Remove
color zoning (rarely used) OR increase color
A diamond buying and selling club (they have them in
trading centers) - ANSWER-Bourse
A type of rock that diamonds form in
- igneous rock (formed from a molten state)
- most diamond form in this rock
- has consistent release of carbon - ANSWER-Peridotite
A type of rock that diamonds for in
- metamorphic rock (rocks that have been altered by heat
and pressure)
- does not have a consistent release of carbon -
ANSWER-Eglogite
How far beneath the earth do diamonds form? - ANSWER-
90-140 miles (140-220 km)
A horizontal tunnel drilled through a diamond pipe -
ANSWER-Drift
, 4|Page
Was named after the owners of a farm where one of the
first diamond rushes took place - ANSWER-De Beers
Consolidated Mines Ltd.
A rough diamond distribution agency
- served as this until 2001 - ANSWER-The Central Selling
Organization (CSO)
The deep vertical formations through which diamonds
traveled to the surface - ANSWER-Pipes
An older underground mining technique
- expensive and dangerous (no longer used)
- block caving is the alternative to this - ANSWER-
Chambering
Most of the diamonds that come from Africa are recovered
from _______ deposits - ANSWER-Pipe, alluvial, and
marine deposits
GIA Diamonds and Diamond Grading Final Exam||
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+||NEWEST
VERSION!!!
What pavilion depth percentage might reflect the girdle
face-up through the table? - ANSWER-37%
Why do diamonds with thick girdles offer less value? -
ANSWER-Paying for more weight than you see
What might be found in a diamond with misalignment
(Aln)? - ANSWER-Misshapen facets
How do shallow pavilion angles affect appearance? -
ANSWER-Make it look foggy
What style describes a diamond that has both brilliant-cut
and step-cut facets? - ANSWER-Mixed cut
What is the area between the head and belly of an oval? -
ANSWER-Shoulders
,2|Page
What is used for total depth percentage calculation in
fancy shapes? - ANSWER-Width of stone (instead of
average girdle diameter)
Why is there no single cut grading standard for fancy
cuts? - ANSWER-Too many variations
What style helps avoid point breakage in fancy cuts? -
ANSWER-French tip
What is the length-to-width ratio for a fancy cut 4.00mm
long and 2.00mm wide? - ANSWER-2:1
How do diamond professionals estimate the weight of
mounted diamonds? - ANSWER-Mathematical formulas
What do appraisers assign to larger mounted diamonds
when color grading? - ANSWER-Single grade
What term describes a diamond whose clarity can become
VVS after repolishing? - ANSWER-Improvable
,3|Page
What is a good case for recutting? - ANSWER-Remove
color zoning (rarely used) OR increase color
A diamond buying and selling club (they have them in
trading centers) - ANSWER-Bourse
A type of rock that diamonds form in
- igneous rock (formed from a molten state)
- most diamond form in this rock
- has consistent release of carbon - ANSWER-Peridotite
A type of rock that diamonds for in
- metamorphic rock (rocks that have been altered by heat
and pressure)
- does not have a consistent release of carbon -
ANSWER-Eglogite
How far beneath the earth do diamonds form? - ANSWER-
90-140 miles (140-220 km)
A horizontal tunnel drilled through a diamond pipe -
ANSWER-Drift
, 4|Page
Was named after the owners of a farm where one of the
first diamond rushes took place - ANSWER-De Beers
Consolidated Mines Ltd.
A rough diamond distribution agency
- served as this until 2001 - ANSWER-The Central Selling
Organization (CSO)
The deep vertical formations through which diamonds
traveled to the surface - ANSWER-Pipes
An older underground mining technique
- expensive and dangerous (no longer used)
- block caving is the alternative to this - ANSWER-
Chambering
Most of the diamonds that come from Africa are recovered
from _______ deposits - ANSWER-Pipe, alluvial, and
marine deposits
