Diamonds grading / Lab-created Diamonds

The Diamonds grading / Lab-created Diamonds course, developed by the WGF (World Gem Foundation), is largely devoted to the gradation of diamond and identification of natural diamonds vs Lab-created diamonds.

This eight day workshop provides ‘hands-on’ experience grading diamonds for colour and clarity, learning the visual techniques used to estimate the proportional components of a diamond (table %, crown angle, pavilion depth %, girdle thickness), polish and symmetry, plotting of inclusions.

Also, you will learn to identify lab-created diamonds.

Who should take this course

This course is aimed at the curious who wish to know more about the world of diamond, students wishing to become professional gemologists or a diamond professional, and at gemmologists wishing to upgrade or deepen their knowledge.


You must have passed the Diamonds course examination.

However, this course may be of interest to professional gemmologists wishing to update or enrich their knowledge. In this case, please contact the EGM at

Language and schedules

The workshop is given in English.

It is also available in French. If you want to register in this language, please go to the French page of the course: Gradation des diamants et diamants créés en laboratoire.

This practical course must be followed on-site at the EGM, classes are held from Monday to Friday, from 9am to 12pm and from 1pm to 5pm, according to the announced schedule. The duration of the course is 8 days.

How to register

Online, by mail or by phone at 514 844-0024. Registration for courses in French has to be done on the French version of the page.

Certificate program

There is a four stone final practical test at the end of this workshop. Students will be required to produce full lab report on each diamond including the colour, clarity, proportional components, origin (natural or lab-created) and the plotting of inclusions.

When you have graduated this workshop, you can pass the final exam so as to get the Diamond Professional Diploma. This practical course is also part of the Career Gemmologist Diploma Program. If you want to obtain it, you have to attend the Coloured Gemstones Grading 1 workshop.

You can consult the Frequently Asked Questions (FAQs) on the WGF website.