Real Diamonds. Grown, Not Mined.
The same fire, the same hardness, the same forever — at a fraction of the price. Welcome to the smartest way to own a diamond in South Africa.
Ready To Choose Today?
A wide selection of ring styles in stock right now, certified for authenticity and quality — sized, engraved and ready in 24 hours, in-store or delivered.
Shop In-Stock RingsStill Weighing It Up?
Compare lab grown, natural and moissanite side by side — or ask a real jeweller anything. No pressure, straight answers.
See The Comparison WhatsApp UsFrom R9,000. In Stock. Ready in 24 Hours.
A wide selection of ring styles, certified for authenticity and quality, from solitaire studs to 2ct+ statement rings — every price shown is what you pay, no negotiation needed.
2.00ct Oval — R28,000
1.00ct Round — R13,000
0.50ct Oval — R9,999
1.05ct Three Stone — R15,999
1.00ct Pear — R13,000
2.03ct Emerald Band — R34,999
See The Full In-Stock Collection →
Lab Grown vs Natural vs Moissanite
The honest comparison — because choosing the right stone starts with straight answers, not sales talk.
Natural Diamond
- Is it a diamond? Yes
- Hardness 10 — hardest known
- Sparkle Classic diamond brilliance
- Tests as diamond Yes
- Price for the look The premium option
- Best for Tradition & rarity
Lab Grown Diamond
- Is it a diamond? Yes — chemically identical
- Hardness 10 — hardest known
- Sparkle Classic diamond brilliance
- Tests as diamond Yes
- Price for the look A fraction of natural
- Best for Maximum diamond for your budget
Moissanite
- Is it a diamond? No — silicon carbide
- Hardness 9.25 — very durable
- Sparkle More "rainbow" fire
- Tests as diamond No
- Price for the look The budget option
- Best for Everyday affordability
See The Size Difference For Yourself.
These are two real rings from our current collection, same 9ct yellow gold, same round brilliant cut, same workshop — just under R2,100 apart in price. That's what an extra half-carat of lab grown actually looks like on the hand.
Yes — They're Real Diamonds. And Yours Comes With Proof.
A lab grown diamond is grown from carbon under the same heat and pressure that forms diamonds underground — recreated above ground. It is not an imitation: even a jeweller's diamond tester reads it as a diamond, because it is one. And because no mining is involved, every stone is guaranteed conflict-free.
Know Your Diamond — The 4Cs
Every certificate grades your stone on four qualities. Here's what they mean in plain language.
Cut
How well the stone is shaped and faceted — the biggest factor in sparkle. This is where craftsmanship shows.
Colour
How white the diamond is. Graded from D (icy white) downwards — the difference is real, but subtler than you'd think.
Clarity
How free the stone is of tiny internal marks. Most are invisible without magnification.
Carat
The weight — and where lab grown wins: more carats for your budget, without compromising the other three.
Why Buy Your Lab Grown Diamond From Cassim & Co.
See It Before You Buy It
Visit our Mall of the South boutique and compare lab grown, natural and moissanite side by side. The price difference will surprise you more than the sparkle difference.
Made & Backed In-House
At Cassim & Co. we manufacture jewellery on site — your ring is sized, engraved and cared for by the people who made it, backed by our workmanship guarantee.
Pay Your Way
Split your purchase into interest-free instalments with Payflex at checkout — take your ring home today, spread the cost over time.
Custom Carat, Cut & Size — Made To Order
Can't find the exact carat or size in our current collection? Our suppliers carry a far wider range than what's on the shelf. Tell us the stone and setting you want and we'll source and manufacture it — same certification for authenticity and quality, same workmanship guarantee.
Aftercare For Life
Professional cleaning, polishing, resizing and repairs — all done in-house by our own workshop, for as long as you own the piece.
Insured Nationwide Delivery
Fully insured delivery anywhere in South Africa, beautifully packaged — or collect in person in Johannesburg.
How It Works
From first look to forever — in four simple steps.
Browse Or Visit
Explore the collection online, or see the stones in person at Mall of the South — no appointment needed.
Choose Your Stone & Setting
Pick a ready-made piece, or design your own around a stone certified for authenticity and quality that fits your budget — including sizes and carats we don't currently have on the shelf.
Sized & Finished In-House
Our workshop sizes, engraves and finishes your piece — made right, by the people who'll look after it for years.
Wear It Forever
Leave with your certificate in hand and our aftercare behind you — cleaning, polishing and care for life.
Don't Take Our Word For It
We're a family jewellery business — our reputation is everything we have. Here's what real customers say on Google, where we can't edit a word of it.
★★★★★
"Ordered a custom ring, the whole process was simple and the services was fantastic. Very helpful from the onset, the ring turned out perfect. I would definitely recommend them!"
Dominique Caldora
★★★★★
"Really loved the service and quick turnaround. Communication was also fast and Nazia was a great help. Thank you"
Tatiana Kalambaie
★★★★★
"The people who worked there are so helpful. I bought a tungsten ring from them today and had it engraved. It looks absolutely phenomenal"
Nichelle Diedericks
★★★★★
"Exceptional service and delivery!!! Received my online order in less than 24 hours and was kept updated of progress of delivery throughout. And the item purchased is simply one of a kind."
Merissa Govender
We reply to every review — the good ones and the hard ones. That's how we'd want to be treated.
Shop Lab Grown Diamond Jewellery
Common Questions
Will people be able to tell it's lab grown?
No. Not by eye, not with a loupe, and not with a standard diamond tester. Identifying a lab grown diamond requires specialised laboratory equipment — which is exactly why certification matters, and why every stone we sell is certified for authenticity and quality.
Do lab grown diamonds lose their sparkle or fade?
No. A lab grown diamond is a diamond — it doesn't cloud, fade or wear. It will look the same in fifty years as the day you bought it, with the same simple care as any diamond.
Is moissanite the same thing?
No — moissanite is a different stone entirely: beautiful and durable, but not a diamond. It's the right choice for some budgets, and we stock a full moissanite range too. If you want a real diamond at the best possible price, lab grown is the answer.
What if the carat, cut or ring size I want isn't in your current collection?
Our online and in-boutique range shows what's ready to ship today, but it's only part of what our suppliers carry. If you're after a specific size — like a 3ct round — or a shape, colour grade, or ring size we don't currently have in stock, message us on WhatsApp or visit the boutique. We'll source the exact stone and manufacture the setting around it, at no extra premium for going bigger.
Can I pay it off in instalments?
Yes — we offer Payflex at checkout, which splits your purchase into interest-free instalments. You take your jewellery home now and spread the cost. Ask in store or select Payflex when you check out online.
Can you resize the ring if it doesn't fit?
Yes — sizing is done in our own workshop at Mall of the South, not sent away. Because we manufacture in-house, adjustments are quick and done properly.
Are lab grown diamonds a good investment?
We'll be honest: no diamond — natural or lab grown — should be bought as a financial investment. You buy a diamond to wear it and to mean something. Lab grown simply means spending less to get more of what you actually see and wear.
Can I view lab grown diamonds in person?
Yes — visit us at Shop G098, Mall of the South, Johannesburg. Bring your budget and we'll show you exactly what it buys in lab grown, natural and moissanite, side by side. No pressure, straight comparisons.
Still Deciding? We're A Call Or Text Away.
Ask us anything — stone sizes, budgets, custom ideas, or just "which one would you choose?" Real advice from real jewellers, no pressure.
Bring Your Budget. Leave With More Diamond.
Browse the collection online, or visit us in Johannesburg and see lab grown diamonds — certified for authenticity and quality — next to natural stones, then decide for yourself. Don't see your exact stone? We'll source it.
Shop The Collection