A diamond grading report is only as reliable as the person who knows how to read one, and challenge it.
What does VS2 look like under a microscope?
How does an H colour sit next to a G?
What does poor symmetry actually do to brilliance?
These aren't abstract concepts. They're practical skills, the kind that let you look at a stone and understand exactly what you're holding, independently of what any certificate says.
Our Diamonds & Diamond Grading course builds that independent judgment. Theory, hands-on lab time, and a two-stone practical exam that makes sure the knowledge is real.
Because in this industry, what you know protects you.
You too can learn how to grade diamonds.
Sign up today!
https://diamondtrainingschool.com/product/diamonds-and-diamond-grading-course/
WhatsApp: +27 71 967 7889
[email protected]
Harry Oppenheimer Diamond Training School
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Harry Oppenheimer Diamond Training School was established in 1991.
We offer various courses, and our qualifications recognised by the South African Diamond and Precious Metals Regulator and we have international recognition for providing quality education. We have added a blending learning option for our rough diamond evaluation course whereby theory is done online with a 5-day practical lab class done at our premises by completing this course you will receive ou
South Africa's diamond story stretches back more than 150 years. And through all of it, the mines, the markets, the trade, one skill has remained irreplaceable:
The ability to look at a rough stone and know exactly what it's worth.
It's not instinct. It's not guesswork. It's a trained, practiced, deeply technical skill, and it's one of the most valuable things a person can bring to any corner of the diamond industry.
If you've ever been curious about how the diamond world really works, this is the place to find out.
Sign up for our Rough Diamond Evaluation course. Next intake - 13 July 2026
https://diamondtrainingschool.com/product/rough-diamond-evaluation/
WhatsApp: +27 71 967 7889
[email protected]
08/06/2026
South Africa is one of the great diamond nations on Earth. At the Harry Oppenheimer Diamond Training School, we've been opening the door to the diamond industry since 1990, for people who want to evaluate rough stones, polish diamonds to perfection, grade polished gems with precision, or understand the world of coloured gemstones.
These aren't generic skills. They're rare, practical, and respected globally.
Whether you're looking to enter the industry, advance within it, or simply understand a world that has shaped this country for over 150 years, there's a course that was built for exactly where you are right now.
The question is: which skill do you want?
Explore all our courses
https://diamondtrainingschool.com/all-courses/
WhatsApp: +27 71 967 7889
[email protected]
30/05/2026
A ruby and a red garnet can look almost identical to the untrained eye. So can a natural sapphire and a synthetic one. Or an emerald and a well-treated piece of glass.
The difference between them? Thousands of rands. Sometimes hundreds of thousands.
Our Essentials for Coloured Stones course teaches you to tell them apart.
You'll learn about 18 of the world's most important gemstones. Their properties. Their imitations. Their treatments. And how to use professional gemological instruments to identify them with confidence.
Because in the gem world, knowledge isn't just interesting, it protects you.
Sign up for our next Essentials of Coloured Stones course
https://diamondtrainingschool.com/product/essentials-for-coloured-stones/
WhatsApp: +27 71 967 7889
[email protected]
29/05/2026
The diamond world is changing fast.
But here's what most people don't know: lab-grown diamonds depreciate like electronics. Natural diamonds still hold their value.
We train professionals who understand both sides of this conversation, because in a market moving this fast, knowledge is everything.
Lab-grown or natural, which would you choose?
Enquire about our courses today
https://diamondtrainingschool.com/all-courses/
WhatsApp: +27 71 967 7889
[email protected]
27/05/2026
Lab-created diamonds and natural diamonds are physically, optically, and chemically identical.
To the untrained eye, they are completely indistinguishable but to a trained diamond professional, the difference is clear.
That is the power of knowing what to look for. And that knowledge doesn't come naturally, it has to be learned, practiced and developed under the guidance of industry experts.
Our Diamonds and Diamond Grading Course teaches you exactly how to tell them apart, and so much more.
The difference between a lab grown and a natural diamond is invisible to most. To our graduates, it never is.
Ready to develop the eye of a diamond professional?
https://diamondtrainingschool.com/product/diamonds-and-diamond-grading-course/
WhatsApp: +27 71 967 7889
[email protected]
25/05/2026
A diamond's value is in the eye of the one who knows.
"I had a basic knowledge about diamonds and Diamond Grading, finally I took the course at Harry Oppenheimer Diamond Training School, it was worth it! Now I enjoy grading, valuation, quoting and diamond pricing."
Knowing how to grade, value and price a diamond isn't just knowledge, it's a skill the industry will always need.
Ready to go from basic knowledge to total confidence? Enquire about upcoming course dates.
https://diamondtrainingschool.com/all-courses/
WhatsApp: +27 71 967 7889
[email protected]
22/05/2026
Most people have never seen a diamond before it's cut and polished. In its rough form, it looks like nothing special, a cloudy, jagged stone pulled from the earth.
But a trained eye sees something completely different.
You too can learn how to see the colour hidden inside. The clarity waiting to be revealed. The exact angle to cut it so it catches light in a way that takes your breath away.
Start your diamond journey today.
https://diamondtrainingschool.com/
WhatsApp: +27 71 967 7889
[email protected]
Your success in the diamond industry starts with the right training.
We provide:
💎 World-class training focused on practical skills
💎 Accredited and certified courses
💎 Customised learning with real industry experience
💎 Global recognition and valuable industry networks
Our programs are designed to equip you with the knowledge and hands-on expertise needed to work confidently with diamonds.
Take the next step in your career.
Sign up today.
https://diamondtrainingschool.com/all-courses/
WhatsApp: +27 71 967 7889
[email protected]
Africa produces over 50% of the world's diamonds, yet most Africans have never held one in their hand, let alone know how to evaluate one.
The knowledge of what makes a diamond valuable, what gives it worth, what makes one stone worth 10x another, has historically lived with a very small group of people.
We're changing that.
Since 1990, the Harry Oppenheimer Diamond Training School has been putting that knowledge into African hands. Real diamonds. Real skills. Real careers.
The continent that produces the diamonds deserves to understand them.
Follow us to learn what the industry insiders know.
https://diamondtrainingschool.com/
WhatsApp: +27 71 967 7889
[email protected]
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Location
Contact the school
Telephone
Address
21 Fricker Road, Office 3B Ground Floor, Illovo
Johannesburg
2193
Opening Hours
| Monday | 07:30 - 16:00 |
| Tuesday | 07:30 - 16:00 |
| Wednesday | 07:30 - 16:00 |
| Thursday | 07:30 - 16:00 |
| Friday | 07:30 - 15:15 |