A diamond dealer you can trust.
More than 25 years in the South African diamond trade, accredited by the industry's most respected bodies — and run personally.
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Mine to finger, for over 25 years.
Founded in 1999, Diagem was built on a simple idea: that buying a diamond should be honest, direct and fairly priced. More than 25 years on, that approach has earned a client base that returns and refers.
We are diamond cutters and dealers, not a retail chain — polishing and shaping our own inventory in South Africa and sourcing direct from mines and trading houses worldwide. Every Diagem diamond is conflict-free. Without the showroom overheads and middlemen that inflate retail prices, the result is genuine value, and a relationship with someone who knows the trade rather than a salesperson on commission.
From the Mine to Your Finger — No Middlemen.
Most diamond websites are front-ends for a supply chain you never see. Diagem is different: we are both diamond polishers and dealers, vertically integrated from rough stone to finished jewellery. That means fewer hands, lower prices, and full transparency at every step.
We Polish Our Own Diamonds
As diamond polishers, we cut and shape our own inventory in South Africa. You are buying direct from the people who worked the stone — not a reseller who bought from a reseller who bought from a dealer.
Vast Stock, View by Appointment
Unlike many online dealers who hold no physical inventory and order only after payment, we maintain a large stock of GIA & IGI certified loose diamonds. Customers can visit by appointment and inspect real stones before committing — a rare offer in today’s online-only market.
Factory-Direct Savings
Every middleman removed is money back in your pocket. Because we control the chain from polishing to sale, the savings are real and significant — not marketing language. Send us a retail quote and we’ll show you the difference.
Because we cut and polish our own diamonds, we control the entire process. Bring us a competitor’s quote with certificate details and we’ll match or beat it on any like-for-like certified diamond. That’s not a promise — it’s what we do every day.
📞 082 551 2103 — Call or WhatsApp
Accredited where it matters.
Certified Diamonds
Every diamond we supply is independently graded by the GIA or IGI — the world’s leading gemological laboratories. Certification documents cut, colour, clarity and carat weight so quality is verifiable, not just claimed.
Diamond Dealers Club of South Africa
The official, internationally recognized trade association and networking hub for South Africa’s diamond manufacturers, dealers, and jewellers. It protects industry ethics, settles trade disputes, and gives members access to the global diamond market.
diamonds.org.za ↗World Federation of Diamond Bourses
Membership of the WFDB — the global network connecting diamond exchanges and trade associations across more than 30 countries — means Diagem operates within an internationally recognised framework of ethical standards and market access.
wfdb.com/about ↗
See what we do.
Explore certified natural and lab-grown diamonds, bespoke engagement rings and fine jewellery, or read the diamond guide. Whenever you're ready, get in touch.
First-Time Buyer? Here’s How It Works.
Call David — he’ll explain everything in plain English. No obligation, no pressure.
Call or WhatsApp David
082 551 2103. Real person, no robots. He answers personally.
View In Person or Remotely
Appointment viewing in Johannesburg or Cape Town. For all other locations, we send photos at every stage and deliver door-to-door, fully insured.
Delivered Anywhere in SA
Fully insured courier to your door. No need to travel — we come to you.
25 Years In The Trade. Still Answering The Phone.
In an industry that's increasingly automated, Diagem remains deliberately personal. Every enquiry — from your first question to the final handover — is handled by David. Not a call centre. Not a chatbot. Not an automated system.
We've spent over 25 years building relationships in the South African diamond trade because we believe that trust is built person to person. Whether you're searching for a specific stone, commissioning a bespoke piece, or simply exploring your options, we leave no stone unturned to find exactly what you need — at a price that reflects our position in the supply chain, not a retail markup.
It all starts with a conversation. Pick up the phone, or send us a message. We'll take it from there.
📞 082 551 2103Call or WhatsApp — real person, real answers
Start the Conversation →Frequently asked questions
Who is Diagem Diamonds?
Is Diagem accredited?
Do you also buy diamonds?
Can I deal with someone directly?
Deal with David directly.
Every enquiry is handled personally, not passed to a call centre. Send a message and you'll hear back from the person who runs Diagem.
Let's find your diamond.
Speak to a dealer, not a salesperson. Get an honest quote with no obligation.