Gemmology Diploma

Learn more about what you will study on Gem-A’s globally-recognised Gemmology Diploma course.

Further your knowledge of Gemmology

At Gem-A, we have supported thousands of students who want to advance their gemmological knowledge and secure a world-recognised and industry-respected qualification.

Our Gemmology Diploma is the most prestigious gemmological qualification in the gem and jewellery trade. You will look at a wider range of gems, synthetics and treatments, and will build upon the practical and theoretical knowledge learned during your Gemmology Foundation course, leading to a more in-depth understanding of gemmology and the principles of gem testing and enhanced gem identification skills.

Graduates of the Gemmology Diploma can apply for Fellowship of Gem-A, allowing them to use the letters FGA after their name. FGA Membership status conveys a student’s knowledge, integrity, membership of a professional body and commitment to professional development, and is highly valued within the gem industry.

Course Details


4 or 9 Months


From £4,600


Gem-A Level 6 Diploma in Gemmology

Study method

Gem-A London, online or at an Accredited Teaching Centre

Who can apply?

Only graduates of our Gemmology Foundation course can apply for the Gemmology Diploma

Eligibility criteria

To be eligible for the Gemmology Diploma, you must have first passed Gemmology Foundation

Course materials provided

Comprehensive Diploma course notes; practical handbook and workbook; Diploma stone set containing 20 rough and cut specimens. Those choosing to study online will also receive a travel microscope

If you have any questions regarding the courses, please contact

Read more detailed information about this course by downloading the syllabus above, or visit the Student Resources area where you can find our prospectus and other useful information.


What will I learn?

Building on from the knowledge gained during the Gemmology Foundation, the Gemmology Diploma course covers a range of advanced skills and techniques.

Gemmology Diploma - Gemmology Diploma - 2d9c6ec24bc1fb99260bf12d63333c7c XL

Gem treatments &

An in-depth look at treatments and synthetic materials, including their production, use, identification and the resulting implications for the gem trade, taking into account the ethical, environmental, and technological implications and applications of gemmology.

Gemmology Diploma - Gemmology Diploma - 35dbf9f9868cc61eca6b56ad6668243d XL

Applying scientifc

How to interpret results from advanced gem-testing equipment and apply scientific principles and concepts to solve gemmological problems, and to assess the validity, reliability and credibility of scientific information related to the study of gems.

Gemmology Diploma - Gemmology Diploma - W04 scaled 2

Gem testing &

How to select, organise and present relevant gemmological information using professional and technical vocabulary. Additionally, how to demonstrate a logical approach to gem testing, and the capability to acknowledge limitations and uses of certain tests. 

I enjoyed every bit of it. I studied it for mainly pleasure and also in the hope I could in some way be involved in the industry… It was certainly challenging but I loved it

Dayanthi Ratnayake
Gemmology Foundation Alumni

How to Study with Gem-A

We have three different study options for you to choose from, in-person at Gem-A London or through one of our Accredited Teaching Centres around the world, or by online distance learning (ODL). Find out more below.

Gemmology Diploma - Gemmology Diploma - W41

Study at Gem-A London

Learners based in the UK can choose to study in person at Gem-A London, situated a stone’s throw away from the world-renowned diamond district.

Gem-A Accredited Teacher Centre Japan

Study at an ATC

Learners around the world can study in person at one of our 40 Accredited Teaching Centres (ATC) found throughout Asia, Europe, America and The Middle East.

Gemmology Diploma - Gemmology Diploma - pexels william fortunato 6393005

Study Online

Gem-A Online Distance Learning (ODL) enables you to study Gem-A’s Gemmology and Diamond qualifications from home and in your own time, no matter where you are in the world.

Upcoming Gemmology Diploma courses

Use the table below to find an upcoming Gemmology Diploma course on-site at Gem-A London or online delivered by Gem-A.

Code Name Start Date DurationPrice (£) Enquire

Ready to apply?

If you wish to apply by post/email please download our PDF application form and send to our London HQ or email to Make sure to review the Terms and Conditions, as you will need to agree to them when completing the application form.


How will I be assessed?

In order to help steer your learnings into an advanced understanding of gemmology, you will be assessed in the following ways.


On the Gemmology Diploma, you will undertake four online assessments


Two examination papers combining theory and practice, plus one practical exam

Lab Class

The practical lab class is only applicable to ODL students.

 Learn more ->


Members get exclusive access
to Gem-A’s publications


Hear from our community


What's next?

Once you’ve completed your diploma you can progress through the following routes

Gemmology Diploma

Gemmology Diploma Awarded

Eligibility for FGA membership status

FEEG Diploma*

Gain your FEEG Diploma

BSc in Gemmology & Jewellery Studies

Gain your BSc degree awarded by Birmingham City University

*Optional: These courses or classes are not required to become a FGA and/or DGA member, or for applying for the BSC in Gemmology & Jewellery Studies delivered by Birmingham City University.