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Ask any diamond expert the question, “What makes a diamond sparkle?” And they will tell you
without hesitation, the cut! No matter what clarity grade or color a diamond has, it will not show forth its
true beauty unless it is cut with skilled precision.
Take note diamond buyers: The cut, made by a masterful gemologist is what makes a diamond
fiery, brilliant and valuable.
If a diamond is not well cut, not only will it not sparkle, its value will be greatly
What is a Diamond Cut?
It refers to the diamond's symmetry, proportions and polished finish.
The Cut of a Diamond
In their most natural form, diamonds are well quite ugly. They have no luster or shine, and in
fact, look like nothing more than broken glass. A diamond must be cut, and then polished before it actually
becomes a thing of beauty.
Diamonds are cut with saws, into round shapes. From the rounded shape, other shapes may be
cut, such as heart shapes but the shape is less important than the quality of the cutting that is being
If the diamond is poorly cut, it will lose light, and it will not sparkle and shine very well.
Each facet of the diamond must be carefully cut into the geometrical shapes that allow the diamond to sparkle
and shine, then the entire diamond is cut into a specific shape, such as an emerald cut or a princess cut
Once the cut is done, the diamond is put into a dop, which resembles a cup with another
diamond only a diamond is strong enough to smooth the edges of another diamond. Once the diamond has been cut
and shaped, and the edges smoothed in the dop, it is polished on a scaif or a diamond polishing wheel.
Diamond Cut Related Terms
Is what differentiates the diamonds ability to reflect light from those lesser abilities found
in other gemstones.
For a round diamond, in order for the crown to provide sufficient fire, the bezel facets
should be cut within a specific range of angles (usually between 33 and 35 degrees). However, this range is
merely a guideline, not a hard-and-fast rule that must be adhered to in every case.
At the outer points of this range, you might find diamonds with crown angles of as little as
31.5 degrees and as much as 35.9 degrees which are still very attractive. These angles do not affect the
diamond's table percentage in any way. It is possible for a diamond's crown to have any combination of crown
angles and table size that a cutter desires.
Is defined as the facets, and the angles at which a diamond is cut. The way they have been
skillfully designed to break up white light as it hits the surface, separating it into its component spectral
colors-red, blue, green etc. This effect, which appears as a play of small flashes of color across the surface
of the diamond as it is tilted, is also called "fire."
Finish is the quality imparted to a diamond by the direct skill of the diamond cutter. The
term "finish" entails every aspect of a diamond's appearance that is not a result of the diamond's natural
existence when it is recovered from the ground.
The diamond's design, the precision of its cutting details, and the quality of its polish are
all a consideration when a gemologist is grading finish. If you examine a diamond's grading report, you will see
its finish graded according to two separate categories: polish and symmetry.
Is defined as any blemish on the surface of the diamond not significant enough to affect
The finish is the precision of the cut, the condition of its girdle and the quality of a
Proportions determines a diamond's optical properties. It refers to the angles and relative
measurements of a polished diamond. The best cut diamonds reflect light back to the eye evenly in the face-up
position; here there no dark areas are visible. Dark or 'dead' areas are due to poor cutting.
When a diamond is well-cut (either a fine cut or an Ideal cut), light enters through the table
and travels all the way to the pavilion where it reflects from one side of the diamond to the other -
intensifying in the mirror-like facets as it travels - before reflecting back out of the diamond through the
table and into the observer's eye. This brightness that should come from the very heart of a diamond is known as
Is defined as the ability to reflect and return white light to the eye. Creating those quick
flashes of light you see as a person tilts the diamond back and forth during normal movement.
Symmetry is a term that refers to the placement and alignment of a diamond's facets and its
flat and polished surfaces. The facets should be cut to achieve the best reflection of light.
Small variations can include misalignment of facets or facets that fail to point correctly to
the girdle (this misalignment is completely undetectable to the naked eye). Symmetry problems are indicative of
diamonds graded as fair or poor.
The table is the largest and top-most facet on the diamond's crown. The table percentage is
the value, which represents how the diameter of the table facet compares to the diameter of the entire diamond.
For example, if a diamond with a 55% table has a table which is 55% as wide as the diamond's outline.
For a round diamond, gemologists calculate table percentage by dividing the diameter of the
table, which is measured in millimeters (this millimeter measurement does not appear on diamond grading reports)
by the average girdle diameter (an average of the first two millimeter measurements on the top left-hand side of
a diamond grading report).
For a fancy shape diamond, table percentage is calculated by dividing the width of the table,
at the widest part of the diamond, by the millimeter width of the entire stone (this total width measurement is
the second of the three millimeter values in the top left-hand corner of the diamond grading report. The Table measurements are subtleties, which vary ever
so slightly and should not become a pre-occupation in your diamond selection.
Diamond Cut Facts:
The cut of a diamond refers to its proportions, symmetry and finish.
Traditional shapes are round, emerald, marquise, pear, oval and heart.
The cut of the diamond is not to be confused with its shape
Without attention to quality cutting, light is lost and not returned to the eye.
Go back to: The Buying Diamonds Guide.
Go back to: The 4 C's of Diamonds
Source: Vicente Ross, DiamondExperts.biz