GIA DIAMOND GRADING QUIZ 1 SPRING 2023
SCORED 98%
The more an inclusion differs in color from its host diamond
the more obvious it is
A feather that reaches a bezel surface as well as the surface of the pavilion main
directly under the bezel
should be plotted on both the crown and pavilion diagrams
In a stone with these clarity characteristics, which would probably be the grade-
setting characterisitc?
feather
Which would disqualify a stone from being IF
Pinpoint
Diamonds with minute inclusions at 10x are
VVS1 or VVS2
A reflector is the result of the inclusions
position
A round brilliant VVS diamond could have
a small pinpoint under a lower girdle facet
VS1 and VS2 stones would be expected to have
minute inclusons
One factor used to determine the clarity grade of a diamond is an inclusions
location
A stone with only a few extra facets on its pavilion that can't be seen face up
should be graded
IF
Inclusions are most visible when located
directly under the table
Squares or rectangles, trigons, and parallel grooves are types of
growth marks
The crystal planes most suitable for cleaving a diamond are the
octahedral planes
Which is the softest crystal direction in a diamond
Dodecahedral
Crystal shape is important in evaluating rough because
it affects the amount of weight retained after cutting
The diamond term glassy refers to
a well-formed octahedral crystal
Naturally occurring, inorganic substance with a characteristic chemical
composition and usually a characteristic crystal structure is known as a
mineral
The habit of gem quality diamond is the
octahedron
Another name for the cubical crystal system is
isometric
, In diamonds, cleavage is caused by
relatively wide spaces between some atomic planes
a flat triangular twinned diamond crystal is called a
macle
The strongest of all atomic bonds are called
covalent
Solid matter with atoms arranged in a regular, repeating pattern is called a
crystal
The smallest group of atoms with a characteristic chemical composition and the
basic crystal structure of a mineral is called a
unit cell
Specific gravity of gem quality
3.52
Atoms in a gem that aren't part of its essential chemical composition are called
trace elements
A notch scratched into a diamond rough to prepare it for cleaving is called a
kerf
The number of facets on a single cut diamond is
17 or 18
An early brilliant that has a circular girdle outline is called
old european cut
The devices that grip and hold a diamond for polishing are known as the
dop and tang
The cutting style with a flat bottom and a variable number of facets that come to a
peak at the top is the
rose cut
The person who decides where to mark diamond rough for fashioning is called
the
planner
The directional properties and structural features of a diamond crystal do not
really matter in
laser sawing
The rotary saw contributed to the diamond cutting industry by
allowing for grater weight retention from rough
To help determine crystal directions, diamond cutters look for
growth marks
A diamond cutters main objectives are to produce an attractive finished diamond
and
maximize profits
The process of polishing the star and upper and lower girdle facets is called
brillianteering
When the rough has a frosty or non transparent surface, the cutter can look for
inclusions by
polishing a window to view the interior
The cast-iron disc on which a diamond is polished is called a
scaife
SCORED 98%
The more an inclusion differs in color from its host diamond
the more obvious it is
A feather that reaches a bezel surface as well as the surface of the pavilion main
directly under the bezel
should be plotted on both the crown and pavilion diagrams
In a stone with these clarity characteristics, which would probably be the grade-
setting characterisitc?
feather
Which would disqualify a stone from being IF
Pinpoint
Diamonds with minute inclusions at 10x are
VVS1 or VVS2
A reflector is the result of the inclusions
position
A round brilliant VVS diamond could have
a small pinpoint under a lower girdle facet
VS1 and VS2 stones would be expected to have
minute inclusons
One factor used to determine the clarity grade of a diamond is an inclusions
location
A stone with only a few extra facets on its pavilion that can't be seen face up
should be graded
IF
Inclusions are most visible when located
directly under the table
Squares or rectangles, trigons, and parallel grooves are types of
growth marks
The crystal planes most suitable for cleaving a diamond are the
octahedral planes
Which is the softest crystal direction in a diamond
Dodecahedral
Crystal shape is important in evaluating rough because
it affects the amount of weight retained after cutting
The diamond term glassy refers to
a well-formed octahedral crystal
Naturally occurring, inorganic substance with a characteristic chemical
composition and usually a characteristic crystal structure is known as a
mineral
The habit of gem quality diamond is the
octahedron
Another name for the cubical crystal system is
isometric
, In diamonds, cleavage is caused by
relatively wide spaces between some atomic planes
a flat triangular twinned diamond crystal is called a
macle
The strongest of all atomic bonds are called
covalent
Solid matter with atoms arranged in a regular, repeating pattern is called a
crystal
The smallest group of atoms with a characteristic chemical composition and the
basic crystal structure of a mineral is called a
unit cell
Specific gravity of gem quality
3.52
Atoms in a gem that aren't part of its essential chemical composition are called
trace elements
A notch scratched into a diamond rough to prepare it for cleaving is called a
kerf
The number of facets on a single cut diamond is
17 or 18
An early brilliant that has a circular girdle outline is called
old european cut
The devices that grip and hold a diamond for polishing are known as the
dop and tang
The cutting style with a flat bottom and a variable number of facets that come to a
peak at the top is the
rose cut
The person who decides where to mark diamond rough for fashioning is called
the
planner
The directional properties and structural features of a diamond crystal do not
really matter in
laser sawing
The rotary saw contributed to the diamond cutting industry by
allowing for grater weight retention from rough
To help determine crystal directions, diamond cutters look for
growth marks
A diamond cutters main objectives are to produce an attractive finished diamond
and
maximize profits
The process of polishing the star and upper and lower girdle facets is called
brillianteering
When the rough has a frosty or non transparent surface, the cutter can look for
inclusions by
polishing a window to view the interior
The cast-iron disc on which a diamond is polished is called a
scaife
