Why is buying direct from a diamond dealer cheaper?

Buying factory-direct removes the retail mark-ups and middlemen built into traditional jewellery store prices. As a dealer with 25+ years in the trade, Diagem sources and sells at wholesale-level pricing.

Does Diagem make bespoke engagement rings?

Yes. Diagem designs and manufactures bespoke engagement rings and fine jewellery to order, helping you choose a certified diamond and build a custom setting around it.

Where is Diagem Diamonds based?

Diagem Diamonds is based in Johannesburg, South Africa, and offers insured delivery nationwide across the country.

How do I get a quote from Diagem?

Message Diagem on WhatsApp or send a short enquiry through the website form. David handles every enquiry personally and replies quickly.

Dealer-Direct Certified Diamonds and Bespoke Jewellery

Q: Are Diagem's diamonds certified?

Yes. Diagem supplies diamonds certified by independent international laboratories including the GIA and IGI, so every stone's carat, cut, colour and clarity are independently verified before you buy.

25 years in the diamond trade — now direct to you.
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Dream it. Design it. Diamond it.

Explore our collections — click to dive deeper

Bespoke Jewellery

Custom-designed and handcrafted to your exact vision

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Natural Diamonds

GIA & IGI certified loose diamonds at factory-direct prices

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Lab-Grown Diamonds

Ethically created, CVD & HPHT certified — same beauty, better value

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Ring Styles

Solitaire, halo, three-stone and bespoke engagement rings

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Diamond Earrings

Stunning certified diamond earrings for every occasion

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Diamond Shapes

Round, princess, oval, cushion and more — find your shape

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Why Diagem?

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Real Person, Not a Robot

Call David. A real diamond expert answers. No chatbots, no automated responses, no call centres — ever.

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From the Mine to the Finger

We cut and polish our own diamonds. From the mine to the finger — no middlemen. That means real factory-direct pricing.

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Beat Any Quote

Send us a competitor's quote with certificate details. We'll beat it on any like-for-like certified diamond.

Industry Credentials

Diagem has spent 25+ years supplying South Africa's diamond trade — dealers, jewellers, and industry professionals. We have now opened our doors directly to the public, bringing factory-direct pricing and trade expertise to individual buyers for the first time.

Verified member of the DDCSA and WFDB — bodies that regulate local and international diamond dealers. Only established, ethical dealers are admitted.

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Diamond Dealers Club of South Africa

Full member of the DDCSA — South Africa's leading body regulating diamond dealers. Membership requires proven ethical standing.

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World Federation of Diamond Bourses

Member of the WFDB — the global authority representing diamond bourses and dealers in over 30 countries worldwide.

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GIA & IGI Certified

Every diamond we supply is independently graded by the GIA or IGI — the world's most trusted gemological laboratories.

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We don't just say we're trustworthy — we're certified by the organisations that define what trust means in the diamond industry.

Reviews on Google

Rated 4.8/5 on Google

4.8/5 on Google Diagem Diamonds cc, as of 25 June 2026

Read Diagem's public Google reviews, or leave your own after working with David.

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❓ First-Time Buyer?

Call David. He will walk you through the entire process in simple terms — from understanding the 4 Cs to choosing the right setting. No obligation, no pressure. Just honest advice from someone who's been doing this for 25 years.

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Frequently Asked Questions

Are Diagem's diamonds certified? +

Yes. Every diamond is independently graded by the GIA or IGI — the world's most trusted gemological laboratories. You receive the full certificate with every purchase.

Do you have physical stock? +

Yes. Unlike many online dealers, we hold a vast inventory of loose certified diamonds available to view by appointment at our Houghton Estate premises in Johannesburg.

Can you beat a competitor's quote? +

We're diamond polishers at the very top of the supply chain. Send us any like-for-like quote with certificate details and we'll beat it — guaranteed.

I'm a first-time buyer. How does it work? +

Call David and he’ll walk you through everything in plain language — the 4 Cs, certification, pricing, and settings. No jargon, no obligation, no pressure.

Do you deliver outside Johannesburg? +

Yes. We offer fully insured courier delivery anywhere in South Africa. Every parcel is tracked and insured for its full value.