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In the present material, we would like to advance the following
assertions:
Assertion 1. Diamond
cut grading should be based not on measured geometric parameters
(a parametric model of the diamond). Another approach, based on
analyzing the complete 3D model of the diamond, is much more effective.
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| Image
generated by the GemAdviser
software on the basis of a 3D model of a real diamond, which
was obtained by Garry Holloway with a Sarin machine. |
The
same diamond in the face-up position, as viewed through an IdealScope.
Photo by Garry Holloway, www.ideal-scope.com
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This analysis can be done by means of computer modeling.
Only symmetric stones can be effectively graded on the basis of
the geometric parameters. An attempt to correctly grade an asymmetric
stone using this approach would face at least two problems.
Namely:
1.1 Taking
into account various deviations of the diamond geometry from the
perfectly symmetric leads to the necessity of introducing more and
more parameters. To correctly describe all these deviations, a very
large number of parameters (such as 100 or 200) may be required.
To make the grading procedure correct, the interrelation between
all these parameters should be analyzed. Otherwise, some negative
consequences may arise. This can be shown using the AGS system as
an example.
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Launch
interactive model 
Click
here to see large photo
