Opals and Jade

The Opals and Jade course, developed by the WGF (World Gem Foundation), is devoted exclusively, as its name suggests, to the study of jade and opal.

The origins of its name, its formation within the earth’s crust, the mistaken belief that it’s a purveyor of bad luck, the optical phenomenon that produces such a mesmerizing and tantalizing array of spectral colours and patterns, … opal is a “stone of mystery”!

On the other hand, jade is not only desired and valued for its beauty. Indeed, it has held a unique and venerable position in the cultural fabric of many great and storied civilizations. We can cite the Chinese empire, where it was once considered its most valuable commodity; the pre-Columbian civilizations of the Olmec, Maya, and Aztec of Central America (Mesoamerica), who valued it more than gold; the Maoris of New Zealand.

Topics covered in the course include their physical and optical properties, geological formation, crystal systems, chemical composition, varieties and classification, cause of colour, absorption spectra, common inclusions, fluorescence, mining, grading criteria, methods of synthesis, gem identification, common treatments and enhancements, cleaning and care instructions, and pricing.

Who should take this course

In order to understand and appreciate this course, gemmological knowledge is required. Jewellers as well as lovers of opals and jade will be able to deepen their knowledge. This course is also aimed at students who wish to become gemologists.

Format and update course

This course is available online, with a digital version only.

As for all WGF courses:

  • The photos of gems available on this course are rewarded for their high quality.
  • Your access to the courses in digital version is acquired for life.
  • The WGF makes an update every two years. Each student receives this update for life and free of charge, and thus remains up to date with the latest developments in the world of gemmology.


No special training is required, but it is advisable to have a good basis in terms of gemmological knowledge.

Language and schedules

The course is presented 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: Opales et jade.

If you wish to take this course in Spanish, please contact us at info@egmtl.com.

This course is only available online in digital version. You start and finish this course whenever you want.

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.

Once registered, you will receive your student access code for the digital version of the courses.

No tutoring is planned for this course. However, if you feel the need for further explanations, you can contact us at info@egmtl.com for a request for individual tutoring by one of the school’s teachers. This tutoring can be given at distance or on the EGM premises. The price of this tutoring is not included in the course.

Certificate program

This course includes one online test at the end of the course. Results are available quickly. A certificate is then issued.

This is a ‘General Interest’ course. After completion, students may upgrade to ‘Coloured Gemstones‘ and receive a credit equal to the value of the cost of this course (the cost will be deducted).