Continue to discover more gems, but now learn how to accurately identify them with instruments and testing methods used by gemmologists: polariscope, refractometer, spectroscope, dichroscope, chelsea filter and UV. Building on the course material seen in Gemmology 1 and 2, students learn systematic testing and observation techniques used by professionals.

Who Should Take This Course

Jewellery professionals and gem lovers alike will benefit from an understanding of gem testing techniques that allow them to identify gems with confidence.

Prerequisites: Gemmology 2.

What You’ll Learn

Students will learn to use standard gemmological instruments including the polariscope, refractometer, spectroscope, chelsea filter, and dichroscope to identify gems based on their physical and optical properties.  At the end of the course, students will be able to follow logical steps of observation and testing to uncover the identity of most gemstones.

What You’ll Receive

All students will receive detailed course notes filled with information and illustrations that will serve as a valuable reference.  Students who successfully complete the course and pass the final exam will receive an attestation from EGM.

Following Gemmology 3, students wishing to continue can enroll in Gemmology 4, where they will learn how to identify and differentiate between similar looking gems.

Languages and Schedule

This course is offered in English (on Wednesdays) and French (on Thursdays). Classes are from 6:00 p.m. to 9:00 p.m. one evening a week for fifteen weeks. See course calendar for dates.

Registration and Payment

Payment is considered as registration. Payment can be made on this page, by debit or credit card by calling the school at (514) 844-0024, by Interac on the email

The price of the course is $550 before taxes, and is subject to applicable taxes: 5% federal tax (GST) and 9.975% provincial tax (QST). 

The final price is therefore $632.36.

Certificate Program

At the end of the workshop and if you have passed the evaluation test, you will receive a certificate from the EGM.

For those who want to further pursue their gemmological training, EGM offers a Certificate program. Students who complete Gemmology 1, 2, 3, and 4, as well as the Diamond Grading and Pearl Grading Workshops can sit the EGM Certificate exams. Students who successfully pass the Certificate theory and practical exams will receive an EGM Certificate in Gemmology.