Talk to David about diamond enquiries in Johannesburg and across South Africa.
David is Diagem's sales executive. Every enquiry — natural diamonds, lab-grown, certified stones, bespoke rings — goes through him directly. No call centres, no automated systems.
The person who answers when you call.
David is Diagem's sales executive and your point of contact for all diamond enquiries. He has been part of the South African diamond trade throughout Diagem's 25+ year history — and every customer conversation, from first question to final handover, goes through him personally.
Whether you're looking for a specific natural diamond, exploring lab-grown options, commissioning a bespoke ring, or simply want to understand what GIA and IGI certification means for your purchase, David is equipped to guide you through the process in plain language — without pressure and without a sales script.
Diagem does not sell online. All transactions are appointment-based: you deal with a real person who knows the stock, understands the certification, and will match any like-for-like certified diamond quote.
What David Can Help You With
All enquiries — whether a quick question or a complex bespoke commission — are handled by David directly, by phone or WhatsApp.
Natural & Lab-Grown Diamonds
David can guide you through natural certified diamonds and lab-grown alternatives — explaining the practical differences in cut, clarity, certification and value so you can make an informed choice.
Engagement Rings & Bespoke Commissions
From classic solitaires to fully bespoke jewellery, David manages the brief from concept through to completion. Engagement ring commissions are appointment-based — he'll walk you through every design and setting option.
GIA & IGI Certified Stones
Every Diagem diamond comes with independent certification. David reads and explains GIA and IGI reports in plain English — cut grade, colour, clarity, fluorescence — so you understand exactly what you're buying before you commit.
Sourcing a Specific Stone
Need a specific carat, shape or budget? David searches Diagem's inventory and, where needed, sources from trusted international trading partners. Bring a competitor's certified quote — he'll show you what the same stone costs at trade-direct pricing.
First-Time Buyer Guidance
Never bought a diamond before? David explains the process from scratch — the 4Cs, what certification to look for, realistic budgets for the Johannesburg market — with no obligation to purchase.
Selling or Valuing a Diamond
Diagem also buys and values diamonds. If you're looking to sell a stone or an heirloom piece, David provides a discreet and fair assessment. Send him photos and certificate details to get the conversation started.
How to Reach David
Diagem operates by appointment. There's no online shop — you deal directly with David, then visit or we deliver.
Call or WhatsApp
Start with a call or WhatsApp message to David on +27 82 551 2103. Tell him what you're looking for — he'll tell you what's available and what it'll cost. No pressure, no obligation.
Book an Appointment
View stones in person at our Johannesburg location — Knox Safes, 1 River Street, Houghton Estate. For buyers outside Johannesburg, David sends photos at every stage and ships door-to-door, fully insured.
Secure Delivery Nationwide
Once you're happy with your stone or piece, Diagem delivers anywhere in South Africa by fully insured courier. No need to travel if you can't get to Johannesburg.
Reach David by Phone or WhatsApp
Prefer to send a message first? Use the contact form and David will reply personally.
Explore what Diagem offers.
Browse natural diamonds and lab-grown diamonds, engagement rings and bespoke jewellery. Read the diamond buying guide before you call, or simply send David a message — he'll take it from there.
Start with a conversation.
Call or WhatsApp David. He answers personally — usually the same day.