View certified natural and lab-grown diamonds by Johannesburg appointment. David helps match certificate, carat and budget before you decide.
25+ years in South Africa's diamond trade. DDCSA & WFDB member — Johannesburg viewings, Cape Town appointments by arrangement with David, and insured nationwide delivery.
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Diagem is advice-led, not online checkout. Send a short brief and David can point you to the right diamond route quickly.
Diagem helps South African buyers choose certified diamonds for sale in South Africa, GIA-certified natural diamonds, IGI-certified lab-grown 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.
If you want to buy diamonds in South Africa, arrange a viewing with David at our Johannesburg diamond office in Houghton. Compare suitable diamonds in person by appointment and discuss your preferences before choosing.
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.
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.
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.
Explore our collections — click to dive deeper
Designed and manufactured to order around certified diamonds
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GIA-certified natural diamonds at factory-direct prices
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Ethically created, CVD & HPHT certified — same beauty, better value
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Solitaire, halo, three-stone and bespoke engagement rings
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Stunning certified diamond earrings for every occasion
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Round, princess, oval, cushion and more — find your shape
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Discover loose tanzanite and jewellery designed around you, complemented by diamonds. Discuss stone options, design and pricing with David.
Explore Tanzanite & Jewellery →Design illustration — not current stock or a previous commission.
WhatsApp David and he will guide you between natural diamonds, lab-grown diamonds, engagement rings and made-to-order diamond jewellery.
Send a WhatsApp inquiry. David answers personally — no chatbots, no automated responses, no call centres.
We cut and polish our own diamonds. From the mine to the finger — no middlemen. That means real factory-direct pricing.
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.
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.
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 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.
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Diagem has supplied South Africa's diamond trade since 1999 — 25+ years serving 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.
Full member of the DDCSA — South Africa's leading body regulating diamond dealers. Membership requires proven ethical standing.
Verify our credentials →Member of the WFDB — the global authority representing diamond bourses and dealers in over 30 countries worldwide.
Learn more →Diagem supplies GIA-certified natural diamonds and IGI-certified lab-grown diamonds, with certificate details explained before you choose. 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.
Recent public Google reviews for Diagem Diamonds. These reviews do not claim to be about this specific page unless the reviewer says so.
“David absolutely knocked it out of the park, was a very easy uncomplicated process, every detail was considered to put my vision to an reality, I would definitely recommend to anyone 10/10 experience 👍”
“Experience was great. Excellent service. Highly recommended.”
“Great place and great people very helpful and everything is top Quality”
Reviews sourced from Diagem Diamonds’ verified Google Business Profile. View Diagem reviews on Google Leave a Google review