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Diamond Grading Report Parameters
A diamond
grading report will commonly include a plotted diagram
of your diamond and significant characteristics,
including the 4Cs (cut, color, clarity and carat
weight). The report will also describe the diamond’s
shape, exact measurements, proportions and depth
percentages as well as grade the polish and symmetry. It
should also comment on the characteristics like
fluorescence, raining, and any imperfections in the
diamond. Please note: a grading report does not include
an appraisal or any kind of statement of monetary worth
of the diamond. Grading reports simply state the
scientific facts of your diamond that can be evaluated
by highly standardized criteria.
It is important to refer to
the certificates issued by GIA (gemological Institute of America) and
AGS (American Gem Society) as Diamond Grading
Reports. This is an important distinction, one that probably came
years after GIA's lab started offering reports. However generally the
diamond industry still uses the terms certificate and grading report
interchangeably. The term certificate or cert for short. A Diamond
Grading Report is a statement, issued by an independent Gemological
Laboratory, that at the time of evaluation, the Diamond in question has
been examined by experienced Diamond Graders, using various gemological
instruments, and determined to contain the characteristics as stated in
the Report.
Grading reports do not give a
value; appraisals do that. They give an independent expert opinion on
quality for loose or unset gems. Most grading institutes have labs or
services worldwide and do not sell diamonds.
A reliable Diamond
Certificate consists of the following important parameters:
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Date of the Report |
Sometimes the diamond can get damaged before the
certification date. Therefore it is important to ask
the retailer to explain the similarity of the
purchased diamond with that in the certification. |
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Unique ID # |
The Identification Number is often laser inscribed
on the diamond, if not, one can always request the
jeweler for the same. IGI uses the terminology
"Diamond Identification Report" although it is
recognized as a certificate. Every lab has a
certificate (or "report") number, which identifies a
diamond uniquely. The Lab keeps an internal copy of
everything shown on the certificate, and also
additional information. The certificates can thus be
re-issued when they are lost. |
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Issuer of the Report |
The Laboratory from where the certificate is issued
should be well constituted and respectable. |
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Origin |
The Diamond’s origins; whether natural or enhanced,
should be verified from the report. Generally,
fractured diamonds are not graded by labs, but laser
drilled ones are accepted. |
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Carat Weight |
Carat weight of the diamond should be accurately
written in the report. Diamonds are weighed to the
thousandth of a carat with a digital measuring
device. On the Report, the weight is rounded off to
the hundredth of a carat. |
|
Shape and Cut |
These parameters are also mentioned in the report,
and therefore should be verified. Shapes can be
categorized as Round, Pear, Heart, Oval, etc.
Cutting Styles can be categorized as Brilliant,
Marquise, Emerald, Princess, Step and Mixed. |
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Measurements |
Accuracy in measurement is very important in
identification of a diamond, as no two diamonds can
have exactly the same dimensions and weight. This is
generally measured in millimeters, typically to a
hundredth of a millimeter. |
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Proportions |
A diamond cut in well planned proportions exhibits
more brilliance and fire. Therefore it is as
important as clarity or color grades. The
proportions of the diamond can be the summed up as
its depth, and its table .Both are expressed as
percentage figures. Depth percent refers to the
percentage depth of the Diamond, measured from the
table to the culet, relative to the width of the
stone. |
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The 4 Cs |
Diamond buyers should
know the 4Cs: cut, color, clarity, and carat weight. |
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Fluorescence |
Fluorescence refers to a diamonds reaction when
exposed to long wave ultraviolet radiations. Too
much fluorescence can make a Diamond less desirable. |
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Plotting |
A Plot is a graphical representation of the
imperfections present in the Diamond. Every diamond
has unique characteristics like fingerprints. By
plotting its characteristics, and combining this
with the physical measurements of a Diamond, a Lab
can uniquely identify each stone. This plot is a
guideline for the Grader in the event that a
customer returns to the Lab and requests
verification on his diamond purchase. Internal
characteristics are plotted in red, and external
characteristics are plotted in green. |
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Comments |
Comments are used to describe characteristics which
are not discussed elsewhere on the certificate, or
to mention the items not plotted or shown. For
example, "insignificant external details are not
shown" is one of the common comments. |
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Comments |
Reading a certificate should be learnt carefully and
is helpful in diamond purchase. However, purchasing
a diamond should not be solely based on its
certification. Some diamonds can look beautiful even
if they don’t seem good from their certification. |
Read more...
More about Diamond
Certification
The Four C’s mentioned above are the
basic guidelines for buying a good quality diamond, but these Four C’s
can only be deciphered by expert gemologists. They use highly
sophisticated spectrometers and other necessary equipment required for
the inspection of diamonds in laboratories. A document is generally
issued by such laboratories explaining the vital characteristics and
grading of the 4 C’s. The 5th C refers to
Certification...
Read more...
Certified Jewelry from Pippin Bass
Our diamond jewelry is manufactured with the best industry standards and each
design is inspected by our experts. We adhere to the highest standards set by
the renown diamond and gem laboratories such as GIA (Gemological Institute of
America) The certificate provides an analysis with grading based on the 4Cs such
as Color, Clarity, Cut and Carat Weight and it will state the estimated retail
value. We top the quality diamonds with our workmanship, customer service, low
price and the 30-day return guarantee to bring you the best value in purchases
you make for you and your loved ones.
All diamond jewelry is not the same. When you shop for diamond jewelry, make
sure you compare quality and final prices. We bring you great jewelry at lower
prices without the discount gimmicks, surcharges or taxes. Browse our designs,
compare our prices and buy with confidence. Click below to see our standard
appraisal card that you will receive with every diamond jewelry purchase.
Read more...
Read about Diamond
History, Diamond Cartel and More......
A symbol of innocence,
justice, faith and strength, the diamond was believed to make its
wearers courageous and victorious over their enemies. When set in gold
and worn on the left side, it held the power to drive away nightmares
and soothe savage beasts. Diamonds were even thought to be so powerful
that they could stop lechery.
Diamonds have lured and
fascinated us for centuries. Their ores and lore recorded romantic and
bloody events in the past. Diamonds have been long cherished and sought
after, fought over and killed for in the human history simply because of
its beauty and the fascination....
Back to Diamond
Information Summary...
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What is in a Diamond Certificate?
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