GIA Diamonds and Diamond Grading 7
LATEST VERSIONS QUESTIONS AND
ANSWERS WITH STUDY GUIDE
DETAILED AND VERIFIED FOR
GUARANTEED PASS, LATEST UPDATE
2025,2026 GRADED A
crystalline - CORRECT ANSWER composed of crystals or related to crystals
crystal planes - CORRECT ANSWER internal directions parallel to a mineral's unit
cell surfaces
crystal shape (form) - CORRECT ANSWER geometric shape of a well-formed
crystal
crystal structure (lattice) - CORRECT ANSWER regular, repeating arrangement of
atoms in a mineral
crystal systems - CORRECT ANSWER categories of crystals based on their
symmetry and internal structure
doubling - CORRECT ANSWER the appearance of double images of a
gemstone's facet junctions on the side opposite the viewer
doubly refractive (anisotropic) - CORRECT ANSWER possessing different
physical or optical properties in different crystal directions
glassie - CORRECT ANSWER a well-shaped, transparent, octahedral diamond
crystal with sharp, square edges
glide plane - CORRECT ANSWER crystal distortion caused during growth when
one part of the lattice is offset in relation to the rest
graining (grain lines) - CORRECT ANSWER visible, shadow-like lines in a
diamond caused by irregularities in the crystal structure
,habit - CORRECT ANSWER characteristic crystal shape of a specific mineral
macle - CORRECT ANSWER a flat, triangular twinned diamond crystal
octahedron - CORRECT ANSWER a form with eight equal triangular faces
singly refractive (isotropic) - CORRECT ANSWER possessing the same physical
or optical properties in all crystal directions
specific gravity (sg) - CORRECT ANSWER ratio of the weight of a material to that
of an equal volume of water
tetrahedron - CORRECT ANSWER in diamond, a group of five carbon atoms with
one at the center
thermal conductivity - CORRECT ANSWER the relative ability of material to
transfer heat
thermal expansion - CORRECT ANSWER capacity of a material to expand when
it's treated
trace elements - CORRECT ANSWER atoms in a gem that aren't part of its
essential chemical composition
twinned crystals - CORRECT ANSWER crystals consisting of two or more
intergrown crystals with opposing crystal directions
unit cell - CORRECT ANSWER smallest group of atoms with the characteristic
chemical composition and the basic crystal structure of a mineral
squares or rectangles, trigons, and parallel grooves are types of? - CORRECT
ANSWER growth marks
the crystal planes most suitable for cleaving a diamond are the? - CORRECT
ANSWER octahedral planes
which is the softest crystal direction in diamond? - CORRECT ANSWER
dodecahedral
crystal shape is an important factor in the evaluation of rough because? - CORRECT
ANSWER it affects the amount of weight retained after cutting
,the diamond term glassie refers to? - CORRECT ANSWER a well formed
octahedral crystal
a naturally occurring, inorganic substance with a characteristic chemical composition
and usually a characteristic crystal structure is known a? - CORRECT ANSWER
mineral
the habit of gem-quality diamond is the? - CORRECT ANSWER octahedron
another name for the cubic crystal system is? - CORRECT ANSWER isometric
in diamonds, cleavage is caused by? - CORRECT ANSWER relatively wide
spaces between some atomic planes
a flat, triangular twinned diamond crystal is called a? - CORRECT ANSWER macle
the strongest of atomic bonds are called? - CORRECT ANSWER covalent
solid matter with atoms arranged in a regular, repeating pattern is called a(n)? -
CORRECT ANSWER crystal
the smallest group of atoms with a characteristic chemical composition and the basic
crystal structure of a mineral is called a(n) - CORRECT ANSWER unit cell
what is the specific gravity of gem-quality diamond? - CORRECT ANSWER 3.52
atoms in a gem that aren't part of its essential chemical composition are called? -
CORRECT ANSWER trace elements
what plane provides the most efficient sawing direction for dividing large, regularly
shaped crystals? - CORRECT ANSWER Cubic plane
A consistent way to communicate diamond quality - CORRECT ANSWER A
diamond grading system provides...
Sells to retailers - CORRECT ANSWER A wholesaler is someone who...
Depend on the market conditions that exist when the lists are published - CORRECT
ANSWER Diamonds prices on wholesale price lists
, Graded more thoroughly than small, low quality ones - CORRECT ANSWER
Large, high-quality diamonds are...
A result of the conditions under which it formed - CORRECT ANSWER Diamond's
supreme hardness and durability are...
Must spend additional time and money to evaluate and develop them - CORRECT
ANSWER Once diamond deposits are located, mining companies...
Appraisal - CORRECT ANSWER An estimation of the value of an article is a(n)...
Reputable gemological laboratories - CORRECT ANSWER The most consistent
and dependable sources of diamond grades are...
Can buy in large quantities - CORRECT ANSWER Substantial price discounts are
available to retailers and jewellery manufacturers who...
Quality - CORRECT ANSWER A diamond's clarity and colour grades indicate its...
Mountings hide details of clarity and cut - CORRECT ANSWER Reputable
gemological laboratories don't grade mounted diamonds because...
Sieves - CORRECT ANSWER Dealers often sort melee by size using...
The world's supply of diamond rough has increased - CORRECT ANSWER The
diamond industry has changed dramatically in recent years because...
The rise of the cutting industry in India - CORRECT ANSWER The Argyle mine in
Australia contributed to...
The specific combinations of the Four Cs - CORRECT ANSWER Wholesale price
lists are usually organised according to...
Growth marks - CORRECT ANSWER Squares or rectangles, trigons, and parallel
grooves are types of...
Octahedral planes - CORRECT ANSWER The crystal planes most suitable for
cleaving a diamond are the...
Dodecahedral - CORRECT ANSWER Which is the softest direction in diamond?
It affects the amount of weight retained after cutting - CORRECT ANSWER Crystal
shape is an important factor in the evaluation of rough because...
LATEST VERSIONS QUESTIONS AND
ANSWERS WITH STUDY GUIDE
DETAILED AND VERIFIED FOR
GUARANTEED PASS, LATEST UPDATE
2025,2026 GRADED A
crystalline - CORRECT ANSWER composed of crystals or related to crystals
crystal planes - CORRECT ANSWER internal directions parallel to a mineral's unit
cell surfaces
crystal shape (form) - CORRECT ANSWER geometric shape of a well-formed
crystal
crystal structure (lattice) - CORRECT ANSWER regular, repeating arrangement of
atoms in a mineral
crystal systems - CORRECT ANSWER categories of crystals based on their
symmetry and internal structure
doubling - CORRECT ANSWER the appearance of double images of a
gemstone's facet junctions on the side opposite the viewer
doubly refractive (anisotropic) - CORRECT ANSWER possessing different
physical or optical properties in different crystal directions
glassie - CORRECT ANSWER a well-shaped, transparent, octahedral diamond
crystal with sharp, square edges
glide plane - CORRECT ANSWER crystal distortion caused during growth when
one part of the lattice is offset in relation to the rest
graining (grain lines) - CORRECT ANSWER visible, shadow-like lines in a
diamond caused by irregularities in the crystal structure
,habit - CORRECT ANSWER characteristic crystal shape of a specific mineral
macle - CORRECT ANSWER a flat, triangular twinned diamond crystal
octahedron - CORRECT ANSWER a form with eight equal triangular faces
singly refractive (isotropic) - CORRECT ANSWER possessing the same physical
or optical properties in all crystal directions
specific gravity (sg) - CORRECT ANSWER ratio of the weight of a material to that
of an equal volume of water
tetrahedron - CORRECT ANSWER in diamond, a group of five carbon atoms with
one at the center
thermal conductivity - CORRECT ANSWER the relative ability of material to
transfer heat
thermal expansion - CORRECT ANSWER capacity of a material to expand when
it's treated
trace elements - CORRECT ANSWER atoms in a gem that aren't part of its
essential chemical composition
twinned crystals - CORRECT ANSWER crystals consisting of two or more
intergrown crystals with opposing crystal directions
unit cell - CORRECT ANSWER smallest group of atoms with the characteristic
chemical composition and the basic crystal structure of a mineral
squares or rectangles, trigons, and parallel grooves are types of? - CORRECT
ANSWER growth marks
the crystal planes most suitable for cleaving a diamond are the? - CORRECT
ANSWER octahedral planes
which is the softest crystal direction in diamond? - CORRECT ANSWER
dodecahedral
crystal shape is an important factor in the evaluation of rough because? - CORRECT
ANSWER it affects the amount of weight retained after cutting
,the diamond term glassie refers to? - CORRECT ANSWER a well formed
octahedral crystal
a naturally occurring, inorganic substance with a characteristic chemical composition
and usually a characteristic crystal structure is known a? - CORRECT ANSWER
mineral
the habit of gem-quality diamond is the? - CORRECT ANSWER octahedron
another name for the cubic crystal system is? - CORRECT ANSWER isometric
in diamonds, cleavage is caused by? - CORRECT ANSWER relatively wide
spaces between some atomic planes
a flat, triangular twinned diamond crystal is called a? - CORRECT ANSWER macle
the strongest of atomic bonds are called? - CORRECT ANSWER covalent
solid matter with atoms arranged in a regular, repeating pattern is called a(n)? -
CORRECT ANSWER crystal
the smallest group of atoms with a characteristic chemical composition and the basic
crystal structure of a mineral is called a(n) - CORRECT ANSWER unit cell
what is the specific gravity of gem-quality diamond? - CORRECT ANSWER 3.52
atoms in a gem that aren't part of its essential chemical composition are called? -
CORRECT ANSWER trace elements
what plane provides the most efficient sawing direction for dividing large, regularly
shaped crystals? - CORRECT ANSWER Cubic plane
A consistent way to communicate diamond quality - CORRECT ANSWER A
diamond grading system provides...
Sells to retailers - CORRECT ANSWER A wholesaler is someone who...
Depend on the market conditions that exist when the lists are published - CORRECT
ANSWER Diamonds prices on wholesale price lists
, Graded more thoroughly than small, low quality ones - CORRECT ANSWER
Large, high-quality diamonds are...
A result of the conditions under which it formed - CORRECT ANSWER Diamond's
supreme hardness and durability are...
Must spend additional time and money to evaluate and develop them - CORRECT
ANSWER Once diamond deposits are located, mining companies...
Appraisal - CORRECT ANSWER An estimation of the value of an article is a(n)...
Reputable gemological laboratories - CORRECT ANSWER The most consistent
and dependable sources of diamond grades are...
Can buy in large quantities - CORRECT ANSWER Substantial price discounts are
available to retailers and jewellery manufacturers who...
Quality - CORRECT ANSWER A diamond's clarity and colour grades indicate its...
Mountings hide details of clarity and cut - CORRECT ANSWER Reputable
gemological laboratories don't grade mounted diamonds because...
Sieves - CORRECT ANSWER Dealers often sort melee by size using...
The world's supply of diamond rough has increased - CORRECT ANSWER The
diamond industry has changed dramatically in recent years because...
The rise of the cutting industry in India - CORRECT ANSWER The Argyle mine in
Australia contributed to...
The specific combinations of the Four Cs - CORRECT ANSWER Wholesale price
lists are usually organised according to...
Growth marks - CORRECT ANSWER Squares or rectangles, trigons, and parallel
grooves are types of...
Octahedral planes - CORRECT ANSWER The crystal planes most suitable for
cleaving a diamond are the...
Dodecahedral - CORRECT ANSWER Which is the softest direction in diamond?
It affects the amount of weight retained after cutting - CORRECT ANSWER Crystal
shape is an important factor in the evaluation of rough because...
