Lab-Grown Diamonds — Real Diamonds, 50-70% Less
Real diamonds, grown above ground. The same brilliance and certification as mined stones — at a fraction of the price.
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Grown, not imitation.
A lab-grown diamond is not a simulant like cubic zirconia or moissanite. It is diamond — identical carbon crystal structure, identical hardness, identical fire — created through either the CVD (Chemical Vapour Deposition) or HPHT (High Pressure High Temperature) process, in weeks rather than billions of years.
Lab-grown diamonds in South Africa are graded and certified by the same independent laboratories that assess mined stones — IGI certified and GIA certified reports are both available, issued on the same internationally recognised 4Cs scale. For many buyers that makes the choice straightforward: the same beauty, the same independent certification, at materially less cost — typically 50–70% less than a comparable natural diamond.
We are dealers in both natural and lab-grown diamonds across South Africa, so our advice is not tied to selling you one or the other. We will lay out the real trade-offs — value, resale, and personal preference — and let you choose the right stone for your budget.
Lab-grown at a glance.
Exceptional value
Expect a notably lower price than a comparable natural diamond — budget toward a larger or finer stone, or toward the setting.
Fully certified
Graded on the same 4Cs scale by the IGI or GIA, with the report stating clearly that the diamond is laboratory-grown.
Identical to the eye
No jeweller can tell a quality lab-grown diamond from a natural one by eye. The brilliance is the same; only the origin differs.
Build something with it.
A certified lab-grown diamond pairs beautifully with a bespoke engagement ring or a custom piece designed around it. If you would like to understand the grading first, our diamond guide explains the 4Cs in plain language, and you can always compare against a natural diamond before deciding.
First-Time Diamond Buyer? Here’s Exactly How It Works.
Call David — he’ll walk you through everything in plain language. No jargon, no pressure, no obligation.
Call David
— or WhatsApp. A real person answers. No robots, no call centres, no waiting on hold.
No-Obligation Chat
David explains everything in plain language. No pressure, no sales pitch — just honest advice from 25+ years in the diamond trade.
View the Diamonds
By appointment at our Johannesburg offices. We can also arrange to meet you in Cape Town.
Design & Approve
For bespoke jewellery, David consults with you at every stage. You receive photos throughout — nothing is a surprise.
Delivered to Your Door
Fully insured courier anywhere in South Africa. No need to travel — we bring the diamond to you.
“Anywhere in South Africa. Real diamonds. Real people. Real simple.”
With over 25 years in the South African diamond trade, we leave no stone unturned to find exactly what you're looking for. Every enquiry is handled personally by David — no chatbots, no automated responses. Real expertise. Real service.
📞 Call DavidLet’s talk →
Frequently asked questions
Are lab-grown diamonds real diamonds?
Are lab-grown diamonds certified?
Why are lab-grown diamonds cheaper?
Will a lab-grown diamond test as a diamond?
What is the difference between CVD and HPHT lab-grown diamonds?
We Beat Lab-Grown Quotes Too
As diamond polishers and cutters at the top of the supply chain, we can source and supply lab-grown diamonds at prices that are hard to beat. Same grade, same certification, better price.
Send us any competitor’s quote with the IGI or GIA certificate details and we’ll show you what we can do. In most cases, we beat it outright.
Send Your Quote →Lab-Grown Diamond Pricing in South Africa
Lab-grown diamonds in South Africa typically cost 50–70% less than a comparable mined stone of the same carat, cut, colour, and clarity. That is not a compromise on quality — it is the same physical diamond material, grown above ground through the CVD or HPHT process rather than extracted from the earth.
The exact lab grown diamond price South Africa buyers pay depends on the same variables that govern all diamond pricing: the 4Cs. Cut, colour, clarity, and carat weight all affect price, whether the stone is mined or laboratory-grown. Certification body also plays a role — an IGI certified lab grown diamond and a GIA certified stone may carry slightly different premiums, though both are graded on the same internationally recognised scale. To understand how these grades affect value, learn about the 4Cs on our diamond education page.
Because we supply both natural diamonds and lab-grown stones, we can show you options side by side — the same carat and grade in both mined and laboratory-grown form — so you can make a genuinely informed comparison before committing.
Diagem sources directly as diamond polishers at the top of the supply chain. There is no middleman retail markup — what you pay reflects the actual wholesale diamond cost plus a modest direct-supply margin. That is how we consistently beat retail quotes on lab-grown diamonds South Africa buyers find elsewhere.
To view certified stones and receive a direct quote, book an appointment at our Johannesburg offices, or send your specifications via WhatsApp and we will respond with options and indicative pricing.
Weighing lab-grown vs natural?
Tell us your budget and the look you want. We'll show certified lab-grown and natural options side by side so you can decide with the facts.
Let's find your diamond.
Speak to a dealer, not a salesperson. Get an honest quote with no obligation.