Contact Diagem Diamonds, Johannesburg
Get in touch

Let's talk diamonds.

The fastest way to reach us is WhatsApp. Message David directly and you'll usually have a reply the same day.

Request a quote

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Three easy ways

Reach Diagem.

WhatsApp is fastest, but a call or the enquiry form below work just as well. However you reach out, you deal with David directly — not a call centre.

Call +27 82 551 2103

By appointment only Knox Safes, 1 River Street, Houghton Estate, Johannesburg, 2196
Office: 011 334 0187
Get directions →

Good to know

Frequently asked questions

How quickly will you reply?
Usually the same day. WhatsApp on +27 82 551 2103 is the fastest way to reach us; enquiries sent through the form are answered personally by David.
Can I visit in person?
Diagem is based in Johannesburg and meetings are by appointment. Message us to arrange a convenient time to view stones or discuss a commission.
Which areas do you serve?
We are based in Johannesburg and serve clients across South Africa, with insured, secure nationwide delivery of diamonds and finished jewellery.
Do you buy diamonds as well as sell?
Yes. If you'd like to sell a diamond or a piece of jewellery, send photos and details through the form or on WhatsApp for a discreet valuation.
GIA certified diamond grading report alongside a loose Diagem diamond — independent quality assurance you can trust
✦ A Personal Promise

You're speaking to a person, not a system.

We've been in the diamond trade for over 25 years, and every single enquiry is still handled personally by David. No chatbots. No automated responses. No "we'll get back to you in 3-5 business days."

Whatever you're looking for — a certified loose diamond, a bespoke engagement ring, or simply some honest advice — we leave no stone unturned to help you find it. It all starts with a conversation.

📞 082 551 2103

Call or WhatsApp — real person, real answers

Not sure what you need? David will help. Call or WhatsApp — no obligation, no jargon, just honest advice from someone who’s been in the diamond trade for 25+ years.

Send an enquiry

Tell us what you're looking for.

Fill in the form and David will reply personally. Prefer to talk now? Use the WhatsApp or call buttons — we're happy to help.

+27 82 551 2103 — WhatsApp +27 82 551 2103 — Call

We never share your details. By sending you agree to be contacted about your enquiry.

Accredited & trusted

Industry credentials you can verify

GIA & IGI

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.

DDCSA

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.

G0010, 3 Sturdee Avenue, Rosebank, Johannesburg

diamonds.org.za ↗
WFDB

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 ↗
Ready when you are

Let's find your diamond.

Speak to a dealer, not a salesperson. Get an honest quote with no obligation.

Request a quote
Chat with David