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| Diamond Grading Process |
From the moment a diamond is entrusted to the World Gemological Institute (WGI) until the moment it is returned to the client with its grading results and report,
it is handled and assessed with the utmost care,security and expertise by our team of highly-trained gemologists and support staff. Using state of the art instruments and industry respected grading procedures,the World Gemological Gemological Institute identifies, assesses and grades each diamond according to the strict standards to which WGI is committed. Every diamond examined at our institute proceeds through.
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Every diamond examined at our institute proceeds through the following grading process:
Registration: As soon as your diamond is brought to our laboratory, we weigh and measure it, and then issue each diamond an identification number. This identification number replaces all
client information as the diamond moves through the laboratory to insure client anonymity and
100% unbiased, objective grading. A receipt including the ID number and initial weight and measurements of all diamonds submitted is given to the customer for their records.
Identification: Each diamond is scanned by DiamondSure™ - and when necessary,DiamondView™ - machines to confirm that it is, in fact, a real, natural diamond.
Weight and Measurements: The diamond is then weighed and measured twice again on
our state of the art measurement devices located in a controlled environment. Our devices are
calibrated at least twice a day, and all efforts are made to keep dust and other factors isolated
away from this room to guarantee the utmost accuracy for all results.
Cut Grading: A comprehensive set of measurements taken from the measurement device,
along with a visual assessment of the diamond’s girdle and culet sizes, are used to calculate
each diamond’s cut grade. There are six cut grades ranging from Excellent/Ideal to Unusual.
All diamonds are visually examined to corroborate the overall accuracy of the cut grade and
then visually assessed for optical symmetry to determine if they display a “Hearts & Arrows”
pattern.
Clarity Grading: The diamond is then analyzed microscopically by a minimum of three gemologists to determine its clarity grade based on the number, type, position and size of
clarity characteristics seen at 10X magnification. Each examination is conducted without
knowledge of the previous gemologist’s determination and all results of this analysis are
stored in a computerized database. Every Diamond Grading Report includes a detailed
plotting diagram of that diamond’s clarity characteristics, while every Diamond Précis includes
a list of grade-setting and identifying clarity characteristics.
Color Grading: Each diamond is then graded for color in a controlled environment on a
scale from D (colorless) to Z (light amounts of color). Again, each diamond is evaluated by a minimum of three separate gemologists without knowledge of the previous gemologist’s determination, to insure objectivity and accuracy.
Report Issuance: After the grading process is completed, your diamond reaches our documentation station, where we print a Diamond Grading Report or Diamond Précis indicating
all grading results. At this point, grading results can be accessed electronically by the client
through our online account management system.
Laser Inscription: Only after all grading is completed are diamonds sent for laser
inscription. All diamonds that receive a Diamond Precis will have their identification number
laser-inscribed on their girdle. This number matches the ID number on the diamond’s report
to insure verification of the issued report and to add additional identification security to the
diamond. For a small additional fee, diamonds receiving a Diamond Grading Report may also
have their ID numbers laser inscribed, and all diamonds may in addition receive inscriptions of specific brand or company names or personal messages for the customer.
If you wish to learn more about the 4 Cs of diamond grading (Color, Clarity, Cut and Carat
weight) please read our short tutorial here.
If you wish to learn more about reading and understanding your Diamond Grading Report or Diamond Précis, please click here.
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