Lab-created and Treated Gems

The Lab-created and Treated Gems workshop, developed by the WGF (World Gem Foundation), is devoted to the practical identification of lab-created and treated gemstones.

This five-day workshop includes practical instruction on how to identify lab-created coloured gemstones with particular emphasis on rubies, sapphires and emeralds. Students will also learn how to detect treatments and enhancements commonly used to improve the appearance of coloured gemstones.

This will allow you to compare and determine if a stone is natural, lab-created or treated.

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: Basic Gemmology,Advanced Gemmolog, Gem Identification and the practical workshop Gem Identification 1 and Gem Identification 2  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: Gemmes créées en laboratoire et gemmes traitées.

This practical course must be followed on-site at the EGM. The workshop takes place from Monday to Friday, from 9am to 12pm and from 1pm to 5pm, according to the announced schedule. The course takes 5 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

This course is part of the Career Gemmologist and Coloured Gemstone Professional diplomas programs. If you wish to follow these programs, the next course is Diamond grading / Lab-created Diamonds.

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