Diamond Grading Quiz 1 Exam Questions with Latest Update
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Course
Diamond grading
Institution
Diamond Grading
Improved technology. - Answer-The shift in emphasis from alluvial to primary diamond mining was due to
Pipe, alluvial, and marine deposits. - Answer-African diamonds are recovered from
Siberia. - Answer-Russia's significant diamond deposits are in
Should be plotted on both the crown and pa...
Diamond Grading Quiz 1 Exam
Questions with Latest Update
Improved technology. - Answer-The shift in emphasis from alluvial to primary diamond
mining was due to
Pipe, alluvial, and marine deposits. - Answer-African diamonds are recovered from
Siberia. - Answer-Russia's significant diamond deposits are in
Should be plotted on both the crown and pavilion diagrams - Answer-A feather that
reaches a bezel surface as well as the surface of the pavilion main directly under the
bezel
Feather - Answer-In a stone with these clarity characteristics, which would probably be
the grade-setting characteristic?
Pinpoint - Answer-Which would disqualify a stone from being IF
VVS1 or VVS2 - Answer-Diamonds with minute inclusions at 10x are
Minor included crystals and feathers. - Answer-VS1 and VS2 stones might have
Position - Answer-A reflector is the result of the inclusions
Dark Field illumination - Answer-Lighting of a diamond from the side against a black,
non-reflective background.
Depth of Field - Answer-The distance that's clear and sharp above and
below a point you focus on with a
magnifier.
Brightfield illumination - Answer-This makes the inclusions stand out as dark objects
against a bright background.
To create this type of illumination, called
A small pinpoint under a lower girdle facet - Answer-A round brilliant VVS diamond
could have
Minute inclusons - Answer-VS1 and VS2 stones would be expected to have
Location - Answer-One factor used to determine the clarity grade of a diamond is an
inclusions
, Flawless - Answer-A stone with only a few extra facets on its pavilion that can't be seen
face up should be graded
Directly under the table - Answer-Inclusions are most visible when located
Growth marks - Answer-Squares or rectangles, trigons, and parallel grooves are types
of
Octahedral planes - Answer-The crystal planes most suitable for cleaving a diamond
are the
Dodecahedral - Answer-Which is the softest crystal direction in a diamond
it affects the amount of weight retained after cutting - Answer-Crystal shape is important
in evaluating rough because
a well-formed octahedral crystal - Answer-The diamond term glassy refers to
Brazil. - Answer-Before the discovery of South Africa's diamond deposits, the world's
two major producers were India and
Octahedron - Answer-The habit of gem quality diamond is the
Isometric - Answer-Another name for the cubical crystal system is
Relatively wide spaces between some atomic planes - Answer-In diamonds, cleavage is
caused by
Macle - Answer-A flat triangular twinned diamond crystal is called a
Covalent - Answer-The strongest of all atomic bonds are called
Crystal - Answer-Solid matter with atoms arranged in a regular, repeating pattern is
called a
Unit cell - Answer-The smallest group of atoms with a characteristic chemical
composition and the basic crystal structure of a mineral is called a
Small and poor in quality. - Answer-Most diamonds from Australia are
Primary. - Answer-Russia's diamond sources are almost all
Indicator Minerals. - Answer-To focus their search for diamond deposits, geologists look
for
Marine Deposits. - Answer-Diamond deposits found at the ocean's shore are
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