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The cut of the diamond determines its shape. There are many different shapes for diamonds. What gives diamonds
its brilliance is its facets. Each flat surface you see on a diamond is called a facet. These allow
light to enter the diamond where it refracts into a rainbow of colors reflecting against other facets until the
light comes out another facet. A diamond cut ideally will reflect the light towards your eyes as shown in the example.
As the image shows, an ideal cut diamond is more effective at reflecting the light back at the viewer. The
less-than-ideal cuts lose the light either through the side of the bottom.
Uncut diamonds are studied and measured in many ways to find its ideal
proportions to maximize its light refraction properties. Each facet must be cut at the correct angle relative
to each other. The top and bottom halves must have the proper depth relative to each other. The table
must be the correct size in proportion to the diamond. And finally, the crown and pavilion must be perfectly
aligned.
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These measurements and percentages are different for each diamond, and are all taken into account in the evaluation of a diamond's cut. In fact, each diamond shape (heart, round, oval, emerald, etc.) has its own set of guidelines for what makes a Premium or Good cut. An 'ideal cut' is a specific set of guidelines that delineate the proportions that give a diamond the highest amount of fire and brilliance. |
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Although the proportions of an ideal
cut vary depending on the source you
talk to (from jeweler to jeweler,
country to country), there are
certain ranges that are generally
accepted as capable of evoking the
most desirable fire and brilliance
from a stone. These ranges must
cause the light entering the diamond
to be reflected and dispersed
through the table (top), not through
the sides or bottom But most of all,
an ideal cut diamond must be cut to
bring out the stone's brilliance and
fire, not retain the most weight
from the rough cut stone. |
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Diamantbids.com
measures
each diamond
we sell by
hand on a
digital
calipers.
Our digital
caliper has
a ±0.02mm
margin of
error. The
following
table
describes
our cut
grades for a
round
brilliant
diamond.
The table
percentage
is the table
width
relative to
the width of
the entire
stone. This
relationship
is important
in
determining
the maximum
fire and
brilliance
of the
stone. A
table
percentage
that is too
big or too
small can
effect how
well the
diamond
disperses
the light.
The depth
percentage
shows the
relationship
of the
length of
the stone
from the
table to the
culet
expressed as
a
percentage.
This
depth-to-width
relationship
is
responsible
for the
diamond
proportion
resulting in
the proper
refraction
of light and
maximum fire
and
brilliance.
|
GRADE |
TABLE
PERCENTAGE |
DEPTH
PERCENTAGE |
|
Ideal
(Best) |
53%
-
57% |
59%
-
62% |
|
Premium |
58%
-
63% |
58%
or
63% |
|
Good |
64%
-
65% |
57.5
or
64% |
It's
important to
note that
some
independent
grading
laboratories
do not grade
a diamond's
cut, while
others do.
The
Gemological
Institute of
America (GIA),
for example,
will only
give an
evaluation
of the
quality of a
diamond's
cut for
round
brilliant
diamonds.
For all
other
diamonds,
only the
shape and
measurements
of the stone
are part of
the report.
It does,
however,
give the
proportions
of the
diamond
(depth and
table
percentages),
girdle
thickness,
and culet
size (if
any) as well
as a general
rating of
the stone's
finish,
including
its polish
and
symmetry.
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