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Certificate

Date of Appearance

Certificates appeared in 1970, they radically changed the ways and customs of the profession.

Its Characteristics

Gemological Certificate

The certificate is a diamond grading report, describing objective factors, both qualitative and quantitative, and an almost infinite combination of all of the variables, based on the 4 c's (cut, clarity, color, and carat), measurements, and physical properties, define each stone.

It appears under a plasticized printed paper on which are noted the characteristics of the diamond which was evaluated. Holograms, particular textures, micro-texts were incorporated into the certificate to secure it.

Laboratories of gemology offer various types of certificates who are declined in several sizes: full certificate, small certificate, credit card format, etc...

You can find on a gemological certificate the following informations:

Diamond Certificate

Shape and Cutting style.

Carat Weight.

Clarity grade.

Color grade.

Fluorescence grade.

Cut Grade (or Proportions), only for round-brillant cut diamond.

Polish.

Symmetry.

Measurements: diameter, width or depth, mini and maxi diameter in millimeters.

Girdle, Culet, Table%, etc...

Date.

Any defect of the stone structure must be noted on the certificate, example: possible trace of laser drilling or « rough » trace.

Laboratories of gemology have sometimes their specificities, some of them will indicate the proportions of the diamond on the certificate (the HRD for example), the others will prefer to indicate the cut grade (the GIA or the IGI for examples).

Online Verification Service: today all the laboratories of gemology offer to check online that the information on your report matches what is archived in their database.

GIA: GIA Check Report (service available for Diamond Grading Reports issued after January 1, 2000)

HRD: HRD Antwerp Certificate Link

IGI: IGI Online Data Retrieval (service available for Diamond Grading Reports issued after June 1, 2004)

EGL: EGL Online Verification

AGS: AGS Check Grading Report

EGL USA: EGL USA Check Grading Report (service available for Diamond Grading Reports issued after 1995)


They offer also optional services such as the laser inscription of the certificate number or the possibility of sealing the diamond in a plastic box, etc...

Upon request, the diamond can be sealed in a plastic holder together with a microfilm of the certificate.

Not only does the sealing keep the diamond safe from damage, grease and dirt, it is also a guarantee that a given certificate and the accompanying stone actually belong together.

Sealed Diamond

Diamond laser inscription

Laser inscription is a process of using a very fine, precise laser beam to write a customized personal message (« I love you », « Marry me », etc...) or certificate number on the girdle. The laser inscription is microscopic, totally invisible to the naked eye.

It can only be seen with a jewelers' 10x magnifying loupe and it does not change the color grade or clarity grade of a diamond.


Be careful with these terms: « clarity enhanced » and « color enhanced » which are noted sometimes on the certificates. It means that you are in the presence of a diamond whose clarity (or color) was modified, in order to improve it. This term is noted on the certificate in the section « Comments ». It is sold at a discounted price.

Gemological Laboratories

The main gemological laboratories in the world, and most known are:

GIA (Gemological Institute of America)

Global Presences: United States, India, South Africa, Botswana, Thailand.

Comments: it is one of the best laboratories of gemology in the world. It is recognized by our profession as being an excellent laboratory. It is reliable and impartial.

Website: GIA

Examples of GIA Certificates:

GIA Diamond Grading Report GIA Diamond Dossier GIA Fancy Color
GIA Diamond Grading Report GIA Diamond Dossier GIA Fancy Color

HRD (Hoge Raad voor Diamant)

Global Presence: Belgium.

Comments: it is one of the best laboratories of gemology in the world. It is recognized by our profession as being an excellent laboratory. It is reliable and impartial.

Website: HRD

Examples of HRD Certificates:

HRD Diamond Certificate HRD Diamond Identification Report HRD Fancy Color
HRD Diamond Certificate HRD Diamond Identification Report HRD Fancy Color

AGS Laboratories

Global Presence: United States.

Comments: it is a very good laboratory of gemology. It is recognized by our profession as being a very good laboratory. It is reliable and impartial.

Website: AGS

Examples of AGS Certificates:

AGS Diamond Quality® Document AGS Diamond Quality® Report AGS Platinum Diamond Quality® Document
AGS Diamond Quality® Document AGS Diamond Quality® Report AGS Platinum Diamond Quality® Document

IGI (International Gemological Institute)

Global Presence: Belgium, United States, India, Thailand, Japan.

Comments: it is a good laboratory of gemology. It is recognized by our profession as being a good laboratory.

Website: IGI

Examples of IGI Certificates:

IGI Certificate IGI Diamond Identification Report IGI Fancy Color
IGI Diamond Certificate IGI Diamond Identification Report IGI Fancy Color

EGL USA

Global Presence: United States, Canada.

Comments: the reliability of appraisal of this laboratory is disputed among the diamond professionals. We advise you to degrade of 1 degree the color and/or the clarity which is noted on their report. In 1986, this laboratory became independent and it is thus more affiliated with the other laboratories EGL (Belgium, Israel, South Africa, Hong-Kong, etc...). This laboratory provide also identification for rough diamonds.

Website: EGL USA

Examples of EGL USA Certificates:

EGL USA EGL USA Analysis EGL USA Fancy Color
EGL USA EGL USA Analysis EGL USA Fancy Color

EGL (European Gemological laboratory)

Global Presence: Belgium, Israel, South Africa, Hong-Kong, United Kingdom, Korea.

Comments: the reliability of appraisal of this laboratory is disputed among the diamond professionals. We advise you to degrade of 1 or 2 degree the color and/or the clarity which is noted on their report.

Website: EGL

Examples of EGL Certificates:

EGL EGL International EGL Fancy Color
EGL EGL International EGL Fancy Color
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GIA: Gemological Institute of America     HRD     IGI: International Gemological Institute     AGS Laboratories
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