Apply now to secure your space!
Unlock the Secrets of Diamonds
Learn from Certified Experts!
A complete course in diamond grading, valuation, and certification. No prior experience needed. The only diamond course leading to the globally recognised professional DGA membership designation.
The Gem-A Diamond Journey
Diamond Diploma
-
Gem‑A Level 5
Diploma in Gem Diamond - 4 or 9 months
- In-person or online*
Start here
DGA Member Designation
The sign of excellence for graduates in the diamond trade, buying, selling, auctioning or valuing diamonds and diamond-set jewellery
Start or Continue your Gem-A journey with the Diamond Diploma
If you are passionate about diamonds and want to expand your knowledge to either kick start or further your career in the diamond market this course is for you.
Who is it best for?
- Complete beginners
- Jewellery sales professionals
- Auctioneers
- Business owners
- Scientists
Apply now for 2026!
Upcoming course dates
Evening Course
In-Person • London
8th September 2025
DAYTIME COURSE
In-Person • London
9th February 2026
ONLINE COURSE
Online • Global*
15th September 2025
"It is imperative that those operating in our industry are competent and demonstrate the highest standards possible. Having Gem-A qualifications is the ‘gold standard’ for any serious practitioner."
Fay Barrow
Gem-A Graduate & Valuer
Study Routes
Choose how and where you want to study. We have three different study options for you to choose from.
Study in London
We offer a fantastic range of facilities for on-site learning at our London headquarters, located next to Hatton Garden, the heart of London’s gem and jewellery trade
Study Online
Gem-A Online Distance Learning (ODL) allows you to study Gem-A Gemmology and Diamond qualifications from home and in your own time
Study at an Accredited Teaching Centre
Gem-A Accredited Teaching Centres (ATCs) are institutions, colleges and schools that have been approved to teach Gem-A courses
What you'll learn
The ethical, social, and environmental impact of the diamond trade, 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
How to grade and value diamonds
Diamond structure, properties & identification
Upcoming Course Dates & Course Information
Our graduates go on to successful careers in the trade, such as buying, selling, auctioning or valuing diamonds and diamond-set jewellery.
To gain real professional standing upon completing the course apply for membership of Gem-A entitling you to use the post nominals DGA – the globally recognised mark of knowledge, excellence and integrity in the Diamond trade.
Qualification
Gem-A Level 5 Certificate in Gem Diamond
Eligibility criteria
Non-native English speakers must have an English qualification, e.g. Academic IELTS (Level 7) or TOEFL (score of 95-120)
Who can apply?
Everyone from complete beginners and jewellery sales professionals, to auctioneers, business leaders and scientists wishing to expand their knowledge
Course materials 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
Membership of Gem-A
This is included for all students for the duration of their course and enables you to benefit from extra resources and publications.
Evening Course
Study In-Person
Location London
Start Date 8th September
Duration 4 months
Cost £3835
DAYTIME COURSE
Study In-Person
Location London
Start Date 9th February 2026
Duration 4 months
Cost £4150
THEORY + PRACTICAL
Study Online
Location Online
Start Date 15th September
Duration Up to 9 months
Cost £2510 - £4000*
*Prices vary dependent on where the in-person practical tuition and exams are sat.
ESTABLISHED IN 1908
Study with Gem-A
Get your globally recognised, industry-renowned qualification. Further your interests, kick start your career or develop your skills in Gem Diamond.
Apply now to secure your space!
