Coloured Gemstones Grading 1

The Coloured Gemstones Grading 1 course, developed by the WGF (World Gem Foundation), is devoted to the practical gradation of coloured gemstones.

This five-day workshop includes practical instruction on how to access the hue, tone and saturation of coloured gemstones using three popular colour grading systems (Gemological Institute of America, GemDialogue and World of Color) and how to grade pearls, jadeite and opals.

This course will help you to define which colour is the best according to the gemstone.

Who should take this course

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


We draw your attention to the fact that you must have validated all your theory course Coloured gemstones before registering.

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

If you wish to obtain the Career Gemmologist or Coloured Gemstones Professional diplomas, it is strongly advised to respect the organisation of the courses as indicated in the right-hand column.

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 pierres de couleur 1.

This practical course must be followed on-site at the EGM. The workshop takes place from Monday to Friday, from 9h to 12h and from 13h to 17h, according to the announced schedule.

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

This practical course is part of the Career Gemmologist Diploma and Coloured Gemstone Professional Diploma Programs.

If you wish to follow these programs, the next course is Coloured Gemstones grading 2.

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