Johannesburg Physical Viewings
Johannesburg clients can view and compare physical diamonds in a real-world environment by appointment. You are not judging only a supplier photo or video on a screen.
Trusted Diamond Dealer in South Africa
View and compare certified natural and lab-grown diamonds by appointment in Johannesburg. David helps you match carat, certificate and budget before you decide.
WhatsApp David For Diamond Options25 years in the diamond trade — now direct to you.
GIA & IGI certified loose diamonds at trade-direct prices — Johannesburg viewings, Cape Town appointments by arrangement with David, and insured delivery nationwide.
Prefer to speak? Call David
Fastest route to useful advice
Not sure where to start? Send David the basics.
Diagem is advice-led, not online checkout. Send a short brief and David can point you to the right diamond route quickly.
- Diamond type
Natural, lab-grown, or unsure - Purpose
Loose diamond, engagement ring, or jewellery - Budget
Your comfortable Rand range - Appointment
JHB viewing or Cape Town by arrangement
Diamond dealer South Africa
Certified Diamonds from a South African Diamond Dealer
Diagem helps South African buyers choose certified loose diamonds, engagement-ring centre stones and made-to-order diamond jewellery with direct guidance from David. David helps with the diamond choice and jewellery design; when the piece is ready, Diagem can deliver in person where necessary or ship nationwide by insured courier.
Supplier Access & Buying Power
Diagem has access to major South African diamond polishers and international suppliers. If a specific diamond is available in the South African market, David has a strong chance to source it better through Diagem's buying power.
Design, Source, Deliver
David helps connect the diamond choice to the jewellery design, then guides the next step — Johannesburg viewing, arranged consultation, personal delivery where necessary, or insured nationwide shipping.
Due Diligence Before You Buy
If you already have a quote from another supplier, send David the diamond details, certificate and price before you buy. He checks fluorescence, cut quality and certificate details that can hide imperfections, then advises whether the diamond is strong value at market price. If it is a good diamond, David will try to source it or quote it at a better price. If it is not a smart buy, he will explain why the imperfections reduce quality and market price.
Ask David to compare your diamond options. Send your budget, diamond type, certificate or quote and he will advise the next practical step.
Dream it. Design it. Diamond it.
Explore our collections — click to dive deeper
Bespoke Diamond Jewellery
Designed and manufactured to order around certified diamonds
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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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Not sure which diamond route to choose?
WhatsApp David and he will guide you between natural diamonds, lab-grown diamonds, engagement rings and made-to-order diamond jewellery.
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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Physical Stock, Real Advice
Diagem is not catalogue-only. David can prepare suitable certified stones for Johannesburg viewing and explain how each option compares on quality, price and certificate details.
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Compare Before You Commit
Already have a quote? Send David the certificate and price. He will check whether the diamond is good value before you pay a deposit elsewhere.
Meet David
Your Diagem sales executive for diamond enquiries.
David handles Diagem's diamond and made-to-order diamond jewellery enquiries directly, from first questions through to appointment planning and certified stone options.
Send him your budget, preferred diamond shape, timeline, or certificate details. He will guide the next step personally and keep the process clear.
Send an enquiry
Tell us what you're looking for.
Send David the basics and he will reply personally. Include your budget, diamond shape, carat size, timeline, or any certificate details you already have.
Buyer enquiry note: Diagem assists customers buying certified diamonds, engagement rings and made-to-order diamond jewellery. We do not handle online sell-your-diamond or sell-your-jewellery requests from website visitors.
Prefer email? Fill in the form below
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.
Verify our credentials →🌐
World Federation of Diamond Bourses
Member of the WFDB — the global authority representing diamond bourses and dealers in over 30 countries worldwide.
Learn more →🔬
GIA & IGI Certified
Every diamond we supply is independently graded by the GIA or IGI — the world's most trusted gemological laboratories. Browse our certified diamonds for sale before you choose a stone.
View loose natural diamonds for sale →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 4.9/5 on Google
Read Diagem's public Google reviews, or leave your own after working with David.
Frequently Asked Questions
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.
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.
Diagem sits close to the diamond-trade source. Send David any like-for-like quote with certificate details and he will compare it against current availability as sharply as possible.
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.
Yes. We offer fully insured courier delivery anywhere in South Africa. Every parcel is tracked and insured for its full value.
Yes. Diagem is a South African diamond dealer based at Knox Safes, 1 River Street, Houghton Estate, Johannesburg. Viewings are by appointment so David can prepare relevant certified diamonds before you arrive.
Yes. Cape Town appointments can be arranged with David where suitable, and Diagem also offers insured nationwide delivery after the diamond and certificate details are confirmed.
No. Diagem's website is for buyers looking for certified diamonds, engagement rings and made-to-order diamond jewellery. We do not handle online sell-your-diamond or sell-your-jewellery requests from site visitors.