“I had a fantastic experience buying an engagement ring for Ashton. I had zero experience with diamonds, but he guided me patiently, honestly, and never pushy. He helped me find exactly the right ring in a short time, and the price was very fair. Highly recommend!”
Made for you
Bespoke Diamond Jewellery — Made for One Person
Diagem is a diamond dealer first. Bring your jewellery idea, choose the right diamond with David, then create a one-of-a-kind piece around it.
Start With The DiamondEngagement rings, diamond pendants and earrings — designed with you, set with certified diamonds, made to your budget. David guides the whole process, no obligation to start.
Recent public Google reviews from Diagem clients
What Our Clients Say ↓
Bespoke jewellery begins with the right diamond.
Diagem’s bespoke service is not a mass-produced online jewellery shop. David first helps you choose a suitable diamond, then the piece is designed and manufactured around that selected stone.
1. Select the diamond
David helps you view and compare suitable certified diamonds and confirms selected physical diamonds available to view by appointment.
2. Discuss the design
Bring inspiration or describe the piece you want: engagement ring, pendant, earrings, bracelet or another custom diamond item.
3. Approve the plan
Johannesburg viewings, with Cape Town appointments arranged through David where suitable. The design and quotation should be approved before manufacturing starts. No unsupported turnaround or workshop-ownership claims are made here.
4. One-of-a-kind result
The finished piece is made for one customer around one selected diamond, not chosen from a generic checkout catalogue. No online checkout is recommended or added.
New to Bespoke Diamond Jewellery? Here's Exactly How It Works.
David guides you through the entire design process — from first idea to finished piece. Plain language, no obligation, no guesswork.
Send Inquiry
Send David a WhatsApp inquiry. Share your idea, your budget, or even just a picture. He takes it from there.
Design Consultation
David walks you through options in plain language. No jargon, no pressure. Just honest advice on what's possible and what makes sense.
View & Choose
See physical certified stones in person at our Johannesburg offices, or arrange a meeting in Cape Town. Choose your diamond with full confidence, not from catalogue photos alone.
Photos at Every Stage
Once design is finalised, we send you progress photos throughout the making process. You approve before we proceed at each step.
Door-to-Door Delivery
Fully insured courier anywhere in South Africa. Your bespoke piece arrives safely, wherever you are in the country.
"Anywhere in South Africa. Real diamonds. Real people. Real simple."
Commission a piece
Have something in mind?
Describe the made-to-order diamond piece you have in mind and David will talk you through what is possible, with a clear quote and timeline.
Craftsmanship
The piece you can't find in a shop.
Some diamond pieces simply do not exist on a retail shelf — a pendant in memory of someone, earrings to mark a milestone, or a ring designed around a certified stone. Bespoke is how those pieces come to be.
Diagem designs and manufactures made-to-order diamond jewellery, set with the same certified diamonds we trade. Because the diamonds come direct and the work is done without a retail mark-up, a bespoke piece often costs less than a comparable ready-made one — while being entirely your own.
Many commissions begin with a specific diamond, occasion or design idea. Bring the idea, diamond brief or reference style, and David will guide the design.
What we create
A few of the things we make.
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New commissions
Pendants, earrings, bracelets and dress rings designed from scratch around a certified diamond.
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Made-to-order pieces
Diamond jewellery designed around a certified stone, personal brief and clear budget.
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Matching sets
Coordinated pieces — ring, pendant and earrings — designed to be worn together.
Start with the diamond.
Every bespoke piece begins with the stone. Explore certified natural or lab-grown diamonds, or if it's a ring you're after, see our bespoke engagement rings. The diamond guide will help you understand quality before you commission.
Bespoke diamond rings
Custom ring design in South Africa.
If your enquiry is a bespoke diamond ring, Diagem starts with a certified stone and designs the ring around it. David can discuss solitaire, halo, oval, three-stone and other engagement ring styles, then guide the metal, setting and proportions before the piece is made.
Appointments are handled from Johannesburg, with Cape Town appointments by arrangement and insured delivery nationwide. This page now supports custom ring design South Africa, bespoke diamond ring, bespoke ring designer and ring design consultation enquiries without sending ring buyers to a generic jewellery answer.
With over 25 years in the South African diamond trade, we leave no stone unturned to find exactly what you're looking for. Every enquiry is handled personally by David — no chatbots, no automated responses. Real expertise. Real service.
💬 Send InquiryLet's talk →
In-house workshop
Made around your selected diamond.
Diagem designs and manufactures made-to-order diamond jewellery, rather than reselling generic stock. Your piece is designed and made to order around a certified diamond — from the first CAD render to the finished setting — so you deal directly with the people who build it.
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From stone to setting
We start with the certified diamond and build the ring around it: a 3D CAD render for you to approve before we make anything, then hand-finishing at the bench.
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Made in Johannesburg
Design and manufacturing happen in-house in Johannesburg, with Cape Town consultations by arrangement and insured delivery nationwide.
Good to know
Frequently asked questions
What kinds of diamond jewellery can you make?
Made-to-order diamond jewellery, including diamond pendants, earrings, bracelets, tennis necklaces, dress rings and men's pieces, designed around certified diamonds.
Do you repair or resize jewellery?
No. Diagem does not offer jewellery repairs or ring resizing. We design and manufacture made-to-order diamond jewellery around certified diamonds.
How long does a bespoke piece take?
It depends on the complexity, but most pieces are completed within a few weeks. We'll give you a realistic timeline up front and keep you updated as work progresses.
Do you work to a set budget?
Yes. Tell us your budget and we'll design toward it, advising where to focus spend for the best result. Buying direct means more of your budget goes into the piece itself.
Verified Google reviews
What Our Clients Say
Recent public Google reviews for Diagem Diamonds. These reviews do not claim to be about this specific page unless the reviewer says so.
“I am absolutely blown away by the experience of dealing with David - he is so knowledgeable, professional, and really went out of his way to find me the perfect stone... and gosh, it is the most beautiful gem i have ever laid my eyes on!! Thank you David”
“These guys were a pleasure to deal with. Nothing too difficult for David - answered all my queries and arranged my VAT (GST) refund- would recommend”
Reviews sourced from Diagem Diamonds’ verified Google Business Profile. View Diagem reviews on Google Leave a Google review
Ready when you are
Let's find your diamond.
Speak to a dealer, not a salesperson. Get an honest quote with no obligation.
For proposals, Diagem also creates custom diamond engagement rings in South Africa with Johannesburg viewings and Cape Town appointments arranged with David.