Diamond Diploma

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

A comprehensive understanding of Diamonds

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.

A comprehensive understanding of diamonds and diamond grading is essential for the buying, selling and trading of diamonds. One of the most valuable diamond qualifications worldwide, our Diploma will give you a comprehensive understanding of diamonds and how the diamond market operates. You will study the properties of diamonds, the factors affecting a diamond’s appearance and properties, learn about diamond grading, the 4Cs (carat weight, colour, clarity, and cut) and the other factors that influence value, as well as how to identify and recognise imitations, synthetics and treatments.

Our graduates go on to successful careers in a number of areas in the trade, such as buying, selling, auctioning or valuing diamonds and diamond-set jewellery. Diamond Diploma graduates must apply for Gem-A Membership in order to continue to use the post-nominal DGA after their name — a sign of excellence in the trade.

Course Details

Duration

4 or 9 Months

Price

From £3,635

Qualification

Gem-A Level 5 Diploma in Gem Diamond

Study method

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

Who can apply?

Everyone from complete beginners and jewellery sales professionals, to auctioneers, business leaders and scientists wishing to expand their knowledge

Eligibility criteria

Non-native English speakers must have an English qualification, e.g. Academic IELTS (Level 7) or TOEFL (score of 95-120). Speak to your preferred Accredited Teaching Centre to find out more about entry requirements in your country

Equipment provided*

Diamond Diploma course notes; set of diamond simulants; diamond grading manual and workbook; diamond crystal model; portable diamond instrument kit, including a 10x loupe, thermal tester, stone tweezers, stone cleaning cloth and a long-wave ultraviolet key ring

If you have any questions regarding the courses, please contact education@gem-a.com

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.

DIAMOND DIPLOMA

What will I learn?

On this course, you will learn about diamonds’ ethical, social, and environmental impact, how to assess and value diamonds accurately, and the science of diamond structure, properties, and identification, including distinguishing between natural and synthetic diamonds.

Ethical, social & environmental implications

Explore the ethical, social, economic, and environmental consequences of diamond mining and trade, addressing issues like conflict diamonds, sustainability, and their impact on society.

How to grade and value diamonds

Learn the precise assessment of a diamond’s quality, including factors such as colour, clarity, and other attributes affecting its value. This part also covers various grading systems and valuation methods that will help you in the field.

Diamond structure, properties & identification

Study the diamond’s internal structure, physical and optical properties, and the mechanisms that produce different diamond types. Additionally, recognising and distinguishing between natural, treated, and synthetic diamonds and compare them to simulants.

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 our London HQ or through one of our Accredited Teaching Centres around the world, or by online distance learning (ODL). Find out more below.

Study at Gem-A London

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

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.

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 Diamond Diploma courses

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

Deadline for applications: 17 August 2025

Code	Name	Start Date	Duration	Price (£)

Ready to apply?

Make sure to review the Terms and Conditions, for our courses, as you will need to agree to them when completing the application form.

COURSEWORK & EXAMS

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.

Assessed Coursework

On the Gemmology Diploma, you will undertake four online assessments

Examinations

Written examination (Diamond Theory Paper 1) and Practical examination (Diamond Practical Paper 2)

Practical Lab Class

Only applicable to online students, culminating in Diamond Practical Paper 2. Accredited Teaching Centre students will complete this practical training and examination as part of their on-site studies.

TESTIMONIALS

Hear from our community

"Gem-A has given me the pass to explore the world of gems to a depth I didn't think was out there until successfully passing my DGA & FGA. Online Distance Learning enabled me to continue my job at our family business, and learn alongside work."

"I highly recommend Gem-A! The teachers were exceptional, providing insightful knowledge and guidance. Their expertise and passion made learning a delight. Gem-A exceeded my expectations and equipped me with invaluable skills for my career in the Gem trade."

"Gem-A gave me the knowledge and the skills to understand the science & beauty of gemstones and the confidence to work as Head of the Laboratory at European Diamond Report. I recommend Gem-A to everyone dreaming of starting a career in this unique industry."

"As a gemmologist appraiser acting as an advisor to extremely important jewellery collections, Gem-A’s Diploma in Gemmology has given me added an added layer of credibility as well as a deeper understanding of gemstones from a more scientific and crystallographic perspective."

Frequently Asked Questions

Are there any benefits I can access while studying with Gem-A?

As part of your student membership, you will have access to two online gemmology publications that are released quarterly: The Journal of Gemmology and Gems&Jewellery, as well as being eligible for a discount in the Gem-A Instruments shop. You will also have access to a special student ticket price for networking events such as the annual Gem-A conference. Students can also apply for a Totum Pro discount card (for UK discounts).

Can I re-do an assessment?

Unless there are proven mitigating circumstances, students will not be able to re-do any assessments. If you are in a situation that you believe would constitute mitigating circumstances, please contact your tutor as soon as you can. More information can be found in the Student Policies and Procedures.

Is there any help available for students with disabilities?

Gem-A can consider additional support for individuals who are disabled, have a learning difficulty or long-term medical condition. If this applies to you, please contact our Student Support Officer at studentservices@gem-a.com to find out more.

Do I need to take any precautions when using equipment?

Students will be using refractive index (RI) liquid in their practical gem testing sessions or lab classes when using a refractometer. RI liquid is commonly used in gemmology when using a refractometer. The Gem-A course extensively covers the appropriate use of refractometers, and therefore, to successfully complete the Gemmology Diploma, you will be required to use the RI fluid. In a classroom environment, the Gem-A tutors will provide you with appropriate information regarding the RI liquid, and you will be taught the recommended handling procedures. Only a tiny drop of RI liquid is used in testing, and the cap on the bottle is always replaced. It is your responsibility to ensure that you appropriately follow the instructions and information provided by your tutor on the use of the RI liquid. Gloves will be provided if you require them when using the RI liquid at the London teaching center.

RI liquid contains diiodomethane, and you may need to exercise precautions if you are pregnant, if you have certain medical conditions, and if you have sensitivity to, or are allergic to, this chemical. Again, your tutors will provide the required information on handling procedures. Please inform your tutors so that they are aware of your needs. If you are unsure, contact your doctor for advice. If you are pregnant, please consider that you may also be sensitive to the smell, which may make you nauseous.

If you are unsure about using RI liquid or if your doctor has advised against using it, please contact education@gem-a.com for further advice or for a copy of the Material Data Sheet.

What are the recommended study hours for my course?

For each course, the recommended self-study hours per week, including time for the reading of the course notes, completing any homework (onsite studies only), and end-of-block reviews and online assessments, are:

Gemmology Foundation

Evening: 6 to 8 hours
Daytime: 4 to 6 hours
ODL: 6 to 8 hours
ODL Fast track: 10 to 12 hours

Gemmology Diploma

Evening: 8 to 10 hours
Daytime: 6 to 8 hours
ODL: 10 to 12 hours

Diamond Diploma

Evening: 10 to 12 hours
Daytime: 8 to 10 hours
ODL: 8 to 10 hours