Diamond Certificate

Date of appearance

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

Its characteristics

CertificateThe 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:
Its weight.
Its clarity.
Its color and fluorescence.
Its proportions.
Its finish.
Its measurements: diameter, height or thickness, minimum and maximum diameter with the girdle.
Any defect of the stone structure must be noted on the certificate, example: possible trace of laser drilling or « rough » trace.

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.

Laser inscription of diamonds 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 reproduced 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 and rigorous are:

GIA (Gemological Institute of America)
– Offices: United States, Italy, Hong Kong, Japan, Korea, Thailand, Taiwan, United Kingdom, Russia, China.

HRD (Hoge Raad voor Diamant)
– Office: Belgium

IGI (International Gemmological Institute)
– Offices: Belgium, United States, India, Thailand, Japan.

AGS (American Gem Society)
– Office: United States

LFG (Laboratoire Français de Gemmologie) Service Public du Contrôle des diamants, perles fines et pierres précieuses in the Chambre de Commerce et d’Industrie of Paris.
– Office: France

Example of gemological certificates

GIA certificate: click to enlarge HRD certificate: click to enlarge IGI certificate: click to enlarge AGS certificate: click to enlarge
GIA HRD IGI AGS
Fancy color certificate
GIA Fancy Color certificate: click to enlarge
GIA Fancy Color
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