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Shape & Cut:
Each diamond is described as to its shape (round, pear, oval,
etc.) and its cut (brilliant, mine, antique).
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Measurements:
Each diamond is measured with a millimeter gauge to the nearest
thousandth of a millimeter. In keeping with trade practice however;
results are given to the nearest hundredth of a millimeter for
all of its major dimensions.
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Weight: Each
diamond is weighed on an extremely accurate digital balance scale
to the nearest thousandth of a carat. In keeping with trade practice
however, results are given to the nearest hundredth of a carat.
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Clarity: Clarity
describes the summation of the number, size, placement and the
nature of inclusions and surface characteristics.
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Fluorescence:
Fluorescence (when present) describes the degree of sensitivity
of a diamond to long wave ultra violet light such as is present
in daylight. When emission is blue this characteristic will enhance
the appearance of the diamond in daylight.
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Comments: Comments
are used to describe characteristics not covered by the above
entries or on the plotting diagram of the G.I.A. report. For example,
"significant graining is present", "minor details
of finish not shown," etc.
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Grading Scale:
The relative position of the grade of each diamond is shown with
respect to the complete grading system.
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Report No.: This
is the report number, which is entered into the GIA's computer
and microfilming system for permanent record.
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Key to Symbols:
Internal and external identifying characteristics are plotted
as close to the facet position as possible. This serves as an
illustration of the clarity grade but more importantly as a basis
for the future identification of this diamond.
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Proportions:
Proportions describe the ratio and angles of the major physical
features of a diamond.
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Finish: Finish
describes details of the polish and symmetry.
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Color: Color
grade describes the position of the color of this diamond with
respect to the color of a series of master stones. "D"
is the highest color grade and best describes the absence of color.
It is from this grade that the term "ice" is
referred to.
Engagements
G.I.A.
Diamond Report