The cut of a Diamond is the
only property which is totally dependent on man. Although often
overlooked, cut is actually one of the most important aspects to
consider when choosing your diamond. A Diamond cutter analyzes the
rough diamond, and has to determine how to extract the most beauty
and most profit out of the rough stone.
Cut refers to not only the
shape of the diamonds, but its proportions and finish, factors which
determine the sparkle of the diamond.
It is possible to take the
same stone, and depending on which method the cutter decides to
use, to either cut it into the most beautiful stone it can be despite
heavy weight loss and perhaps lower monetary value. Or else, he
can cut a stone to its maximum weight and monetary value, but lose
some "brilliance" and "sparkle"!
You see, even if you have
two equal polished diamonds, both the same carat size, both the
same color, both the same clarity, they may look completely different.
How? There are many different shapes, and facets in a diamond. The
weight can be distributed in different parts of the stone.
The goal in terms of extracting
the greatest beauty from a Diamond, is to have light enter a Diamond,
disperse the light as it bounces inside the Diamond, thereby producing
the different colors and sparkly effect, and finally returning as
much light to the eye as possible.
According to conventional
wisdom, the proportions shown at the top of this page are the best
for maximum light return. The 2-dimensional illustration below shows
the theoretical path a ray of light will take through an ideal-cut
As you can see, the rays of light entering the Diamond, reflect
back to the eye. But it is possible for a diamond cutter to extract
more weight out of the diamond by increasing the diameter of the
stone. This will make the stone too shallow, and light may escape
from the side of the stone, as shown here...
or leak out of the bottom of the stone, like here...
Another side-effect of this cut, is that it makes the stone appear
larger. Don't be fooled by this. The fact that it appears larger
than it is does not make it a better stone. If you compare a shallow
stone to a well-cut stone, you will see the difference in how the
well-cut stone "lights up".
By the same token, it is
common to see the opposite problem. A stone which is cut too deep
will "leak out light" in much the same way as the shallow
stone. Here are two illustrations . . .
and 2) .
This is not to say that a
shallow or deep stone is a sign of a poor, or "low-quality"
diamond cutter. Sometimes the shape of the rough diamond makes it
impractical to cut a stone closer to "ideal" proportions
without losing significant weight. But it is important to note the
"light leakage" which will result from this cut.
Recently, GIA has published
the first report of their 8-year study of the cut of Diamonds, using
a 3D model rather than the 2D model in use since the early part
of this century. So far, nothing practical has come out of this
research, other than making the point that there are definciencies
in the 2-Dimensional model, and that there are a great many different
angles and proportions which can be just as beautiful as what is
accepted as Ideal-Cut today. This point is well known to anyone
who has graded many Diamonds.
How much does
"cut" affect cost?
The effect of all the different
properties of Diamond on Cost is discussed in more detail in the
section. For cut, it can vary depending on the quality of the Diamond.
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