Unlock the World of Diamonds
Accredited training. Expert instructors. Global recognition.
who we are
The Harry Oppenheimer Diamond Training School is a globally recognized institution, established in 1990 to provide specialized, high-quality education in diamond manufacturing, evaluation, and grading. Named in honor of diamond industry icon Harry Oppenheimer, we uphold a legacy of excellence, integrity, and innovation. As a certified, non-profit organization, we offer a wide range of courses. All our courses are led by experienced industry professionals. We are located in Johannesburg and welcome students worldwide.
Practical Learning with Real Diamonds
Our courses are designed to provide immersive, hands-on learning experiences. Each student works directly with real diamonds and gemstones, practicing evaluation, grading, and polishing techniques under the guidance of seasoned professionals.
World-Class Instructors
Our instructors bring decades of industry experience and international qualifications, offering our students a wealth of knowledge and mentorship. With a passion for gemology and a commitment to student success, our instructors are dedicated to helping each individual develop the skills they need to thrive in the diamond sector.
Blended Learning for Flexibility
We understand that learning should be accessible and adaptable. That’s why many of our courses are structured as blended learning programs, allowing students to complete theoretical modules online from anywhere in the world before coming to our facilities for practical, in-depth training.
Comprehensive Curriculum
From Rough Diamond Evaluation to Diamond Grading and Polishing, our curriculum covers all essential areas of diamond and gemstone expertise. Each course is thoughtfully crafted to ensure students gain a thorough understanding of gemology, from the foundational 4 Cs (Color, Clarity, Cut, Carat) to advanced diamond grading and polishing techniques.
The Harry Oppenheimer Diamond Training School is a globally recognized institution, established in 1990 to provide specialized, high-quality education in diamond manufacturing, evaluation, and grading. Named in honor of diamond industry icon Harry Oppenheimer, we uphold a legacy of excellence, integrity, and innovation. As a certified, non-profit organization, we offer a wide range of courses—from Rough Diamond Evaluation to Diamond Polishing and GIA-accredited Gemstone Grading—led by experienced industry professionals. Located in Johannesburg, we attract students worldwide, equipping newcomers and seasoned professionals alike with the skills and expertise needed to thrive in the diamond industry.
Practical Learning with Real Diamonds
Our courses are designed to provide immersive, hands-on learning experiences. Each student works directly with real diamonds and gemstones, practicing evaluation, grading, and polishing techniques under the guidance of seasoned professionals.
World-Class Instructors
Our instructors bring decades of industry experience and international qualifications, offering our students a wealth of knowledge and mentorship. With a passion for gemology and a commitment to student success, our instructors are dedicated to helping each individual develop the skills they need to thrive in the diamond sector.
Blended Learning for Flexibility
We understand that learning should be accessible and adaptable. That’s why many of our courses are structured as blended learning programs, allowing students to complete theoretical modules online from anywhere in the world before coming to our facilities for practical, in-depth training.
Comprehensive Curriculum
From Rough Diamond Evaluation to Diamond Grading and Polishing, our curriculum covers all essential areas of diamond and gemstone expertise. Each course is thoughtfully crafted to ensure students gain a thorough understanding of gemology, from the foundational 4 Cs (Color, Clarity, Cut, Carat) to advanced diamond grading and polishing techniques.
our courses
Rough Diamond Evaluation
This course provides a practical introduction to the diamond industry, from understanding rough diamond evaluation and planning to diamond polishing basics.Â
Diamond Polishing
Learners are provided with natural diamonds and the necessary tools and equipment to polish these diamonds to perfection in a factory environment.Â
Diamonds and Diamond Grading
This course has two components, where students are taught the background of Diamonds and Diamond grading from formation through to the pricing of a polished diamond.Â
Essentials for
Coloured Stones
To give the student background knowledge and understanding of the most popular 18 gemstones, their properties, common simulants and synthetics.
Essentials for Rough Diamond Evaluation
Students are taught to understand the characteristics and estimate the Clarity, Cut, Colour and Carat- Weight of a rough diamond.
Entrepreneurial Valuation & Polishing Course
This course is ideal for business professionals who want to quickly gain practical knowledge of rough diamond valuation and polishing, without committing to longer programmes.
Rough Diamond Evaluation
This course provides a practical introduction to the diamond industry, from understanding rough diamond evaluation and planning to diamond polishing basics.Â
Diamond Polishing
Learners are provided with natural diamonds and the necessary tools and equipment to polish these diamonds to perfection in a factory environment.Â
Diamonds and Diamond Grading
This course has two components, where students are taught the background of Diamonds and Diamond grading from formation through to the pricing of a polished diamond.Â
Essentials for
Coloured Stones
To give the student background knowledge and understanding of the most popular 18 gemstones, their properties, common simulants and synthetics.
Essentials for Rough Diamond Evaluation
Students are taught to understand the characteristics and estimate the Clarity, Cut, Colour and Carat- Weight of a rough diamond.
Entrepreneurial Valuation & Polishing Course
This course is ideal for business professionals who want to quickly gain practical knowledge of rough diamond valuation and polishing, without committing to longer programmes.
