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Sarin DiaMension Computerized Proportions Analysis
State of the art... Facet by Facet... In depth evaluation technology.
Would you purchase a new car without
knowing whether it had a four, six or eight cylinder engine? Of
course not! Then
why would you consider buying a diamond without knowing how well it has
been cut? After all, most of the visual properties of a diamond are
controlled by the Crown and Pavilion angles which are the primary
reflective surfaces of a diamond... And of the two, the pavilion angle
is the critical factor.
Assuming
that a diamond has been cut to "ideal proportions" simply because
it has the "right" table and total depth measurements is foolish, but unfortunately this is what many consumers are
being asked to do by disreputable dealers who rely on diamond grading reports
that fail to provide complete
information.
In order to determine the proportions rating of a diamond, you must know
the specific measurements for the following factors:
|
However, most of the diamond grading
reports relied on by diamond buying consumers only contain the following
measurements:
|
Thus the average measurements for the
Crown & Pavilion angles are undetermined and there is no way of
actually knowing the proportions rating for the diamond... The importance of knowing
the measurements for these two factors is that together they control about
98% of the visual properties of a diamond...
The easiest and most accurate way to determine
the specifics of the missing factors (Crown & Pavilion angle) is to obtain
a Sarin DiaMension or OGI Nova Scope
computerized proportions analysis. Both the Sarin and the OGI
machines offer the same basic information and level of accuracy, the choice to use one machine over
the other is really a matter of personal preference, similar to how you
may choose to
drink Coke instead of Pepsi.
In the past, we relied on a OGI Nova Scope, but
switched to a Sarin DiaMension in December of 2005 in order to provide our
clients with a more in-depth evaluation of the proportions that include
a three dimensional model of the diamond. This virtual model will
provide you with a the ability to evaluate the diamond you are
considering facet by facet. To view the 3D Proportions Analysis
for diamonds listed in our Private
Reserve simply click on the "Full Details" link which can be found
in the "In Depth Evaluation" column and then click on this image:
Note that you will need to download the Sarin Viewer from Sarin Technologies and install it on your system and that you can view only one Sarin DiaVision file on your computer at a time, you will need to close one file to view another.
The unit we use in our office is the same level of Sarin
that is used by the GIA and AGS diamond grading laboratories during
their evaluation process. The machine cost a little more than $45K and provides us
with better optics and a higher level of accuracy that is not available
from the smaller, less expensive units five thousand dollar unites used by many
diamond retailers. In addition, the larger machine enables us
to determine the proportions rating for round brilliant cut diamonds up to thirteen carats and
a larger
range of fancy shape diamonds.
In the past, the results of the Sarin and OGI computerized proportions
analysis were printed on an Avery type label
that looked like this:
However significantly more detailed reports are currently available as
will be discussed in detail below... We will explain how to decipher
the information provided on the label however because we attach this label
to the scan of the diamond grading reports we post on-line in addition to
making the full version of the proportions analysis available...
The top line on the label format provides a reference NiceIce which
indicates that we provided the proportions analysis for this diamond.
There is also a reference to the carat weight of the diamond and an
indication as to the overall proportions grade of the diamond
highlighted in black as Total Grade: 0 which indicates that the diamond
has zero ideal cut proportions. It is important to understand that
the overall proportions rating does not take into account the Polish &
Symmetry grades of the diamond. Sarin and OGI computerized
proportions analysis machines are
not capable of grading the polish, symmetry, clarity or color of
diamonds, the machines only grade the proportions...
In this case, the second line which begins with "Diameter" indicates that the
average outside diameter of the diamond is 7.15 mm which is the average of
the minimum (7.13 mm) and maximum (7.17 mm) measurements.
The third line "Total Dep." states
the depth measurement of the diamond which in this case is 3.97 mm and as
a percent measurement (stated here as 60.8%) which is how it would be
stated on the diamond grading report issued by a gemological laboratory.
The fourth line "Table" provides us with the diameter of the table in
millimeters (stated here as 4.07 mm) and as a percent measurement
(stated above as 57.0%) which is how it would be stated on the diamond
grading report issued by a gemological laboratory.
The fifth line "Crown" provides the average crown angle measurement (34.2
degrees) which is the average crown angle measurement based upon the eight
individual measurements of the kite shape bezel main facets. The
percentage measurement (14.7%) is not actually measured by the Sarin or
OGI machines, but rather is estimated mathematically, thus the angle
measurements determined by the machine are more accurate because they were
actually measured.
The sixth line "Pavil" provides the average pavilion angle measurement
(40.9 degrees) which is the average pavilion angle measurement based upon
the eight individual measurements of the triangular lower girdle facets.
The percentage measurement (43.1%) is not actually measured by the Sarin
or OGI machines, but rather is estimated mathematically, thus the angle
measurements determined by the machine are more accurate because they were
actually measured.
The last line "Culet" refers to the size of the culet which is facet that makes up the
bottom point of the diamond. We actually ignore this measurement on
the Sarin and OGI results because they seem to vary greatly and seem to be
the one factor for which the results never make sense... Neither
Sarin or OGI have been able to provide us with what we consider to be a
reasonable explanation for this apparent phenomena, so we just go by what
the labs determined the culet size to be...
When the Sarin and OGI machines were first introduced on the market, the
label which provided this information was "state-of-the-art" and thus was
an excellent resource for consumers. However recent technological
advances and improvements to the software packages used by the Sarin and
OGI machines have made it possible to provide consumers with more
information than used to be available. This is what the new Sarin
DiaMension reports look like:
The primary difference between this report and the results provided on the label shown previously on this page is the amount of information that is made available to the consumer. With such detailed information now being available, we don't know why anybody would accept the basic label format anymore... Not only are the averages shown on the new report format, but the high and low measurements that resulted in those averages are also provided in the upper left section of the report pictured here:
In this case, the average of 34.2 degrees for the crown
angle is based on a low of 34.0 degrees and a high of 34.5 degrees, but it
could just as well have been based on a low of 33.7 degrees and a high of
34.7 degrees... Obviously, the tighter the range between the high
and low measurements the better... Where did we get the high and low
measurements used in this example? From the Pavilion and Crown
graphs which appear at the bottom of the full page Sarin results...
The facet by facet measurements for pavilion and crown angle are
indicated on the graphs along with a numerical reference to the facet
number for which the measurement applies.
While your first instinct might be to compare the facet measurements one
by one in a clockwise direction, the correct way to decipher the information is actually to add the
measurements of each opposing facet together and evaluate the consistency
based on the sum of those measurements. In other words, you should
not determine how well this diamond has been cut by comparing the Crown
Angle measurements starting at the twelve o'clock position and reading
around in a clockwise circle, but rather by the sum of the averages as
follows:
Facet 7 (34.2 degrees) plus Facet 3 (34.2 degrees) = 68.4
Facet 8 (34.1 degrees) plus Facet 4 (34.3 degrees) = 68.4
Facet 1 (34.0 degrees) plus Facet 5 (34.3 degrees) = 68.3
Facet 2 (34.2 degrees) plus Facet 6 (34.5 degrees) = 68.7
Thus the average consistency for the Crown Angle is within
four one hundredth's of a degree... Obviously the tighter the
range, the better the consistency of cut... Deciphering the
information for the Pavilion Angle is done the same way, based upon the sum
of the opposing facets... However, the location of the facets are
different because you are
looking at the bottom view of the stone, thus if you were to rotate the
position of the bottom view graph so
that it faced bottom the two halves would align top to bottom...
There are many other report formats available for each diamond listed on
our Private Reserve based upon the
Sarin DiaMension computerized proportions analysis so be sure to click
on this icon when reviewing the diamond details page:
Remember that you will need to download the
Sarin Viewer from Sarin Technologies and install it on your system
and that you can view only one Sarin DiaVision file on your computer at
a time, you will need to close one file to view another.
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