IGI-certified lab-grown diamonds for sale in South Africa
Lab-Grown Diamonds South Africa
Loose IGI-certified lab-grown diamonds from around R3,000 excl. VAT (R3,450 incl. VAT) as a guide. Send David your shape, carat and budget and compare current options before you choose.
Prices are indicative and subject to exchange-rate changes. Confirm your final quote with David.
IGI-certified
Diamond dealer since 1999
DDCSA & WFDB member
Johannesburg viewings by appointment
No online checkout
Quick answers
What buyers want to know first
What will it cost?
Loose-diamond guide examples start from R3,000 excl. VAT (R3,450 incl. VAT); 1ct from R4,000 excl. VAT (R4,600 incl. VAT); 2ct from R7,000 excl. VAT (R8,050 incl. VAT). Settings are extra. Current prices depend on the IGI certificate and availability. See guide prices.
Which certificate?
Diagem supplies IGI-certified lab-grown diamonds and GIA-certified natural diamonds. What the IGI report shows.
Where can I view them?
Johannesburg, by appointment. Cape Town and elsewhere by arrangement with David. How viewing works.
Want a ring, not just a stone?
Engagement rings with a 1-carat lab-grown diamond in 9-carat gold, from R10,000 excl. VAT (R11,500 incl. VAT). Choose the diamond first, then plan the setting with David. Lab-grown engagement rings.
Prices are indicative and subject to exchange-rate changes. Confirm your final quote with David.
Lab-grown diamond prices
Lab-grown diamond guide prices
Lab-grown diamond prices change with the IGI certificate, carat, cut, colour, clarity, shape and availability. Use these guide examples as a starting point, then ask David for today’s IGI-certified options.
From R3,000 excl. VAT (R3,450 incl. VAT)Entry guide options1ct from R4,000 excl. VAT (R4,600 incl. VAT)Loose diamond only; certificate-dependent1.5ct from R5,000 excl. VAT (R5,750 incl. VAT)Subject to availability2ct from R7,000 excl. VAT (R8,050 incl. VAT)Quote current options
Loose diamonds only; ring settings are extra. Guide prices only. Diamond prices and availability change. Ask David for current options and up-to-date prices.
Prices are indicative and subject to exchange-rate changes. Confirm your final quote with David.
What changes the price
Carat, cut quality, colour, clarity, shape and the IGI report itself. Two diamonds with the same carat can look and cost very differently.
More diamond for your budget
Lab-grown diamonds usually cost considerably less than natural diamonds of a similar grade, so many buyers choose a larger or better-graded stone for the same budget.
Send your budget, get real options
David quotes IGI-certified diamonds that are available now, not a generic price list.
IGI-certified diamond. Ring setting quoted separately.
Complete 1 ct lab-grown ring
From R10,000 excl. VAT R11,500 including VAT
1-carat lab-grown diamond in 9-carat gold.
Starting prices are indicative and subject to exchange-rate changes, specifications and availability. Confirm your final quote with David.
Lab-grown engagement rings
Choose the diamond first. Build the ring around it.
David helps you balance the loose diamond and setting within your total budget, then guides the design and manufacture.
Engagement rings with a 1-carat lab-grown diamond in 9-carat gold, from R10,000 excl. VAT (R11,500 incl. VAT).
Prices are indicative and subject to exchange-rate changes. Confirm your final quote with David.
Gold is a significant part of your ring’s cost. The gold weight, diamond and design all affect the final price.
Choose the diamond. Send David your preferred shape, carat and total budget. He compares suitable loose IGI-certified options and explains the reports.
Plan her ring. Share inspiration photos and choose a solitaire, halo, three-stone or bespoke design around your diamond. Review a 3D CAD render before you commit.
Approve the design and finger size. Specialist trade jewellers make the approved ring to a high standard, with factory-direct pricing.
The same diamond-first approach can be used for bespoke pendants, earrings and other jewellery.
Diamond first, then the design direction.Diamond first, then the design direction.
Compare suitable loose IGI-certified diamonds side by side at our Johannesburg office, by appointment. Ask David what is physically available to view. Cape Town and other locations are by arrangement with David.
Personal guidance from David, Diagem’s sole client contact.
Every lab-grown diamond Diagem offers comes with an IGI report. It records the carat, cut, colour, clarity and measurements, so you can compare like with like and know you are buying a real lab-grown diamond — not moissanite or cubic zirconia.
IGI reports at Diagem
At Diagem, lab-grown diamonds use IGI certification. GIA certification applies to Diagem’s natural diamonds.
Read beyond the grade
Cut, polish, symmetry and proportions change how bright and how large a diamond looks. David explains what the report means for the diamond in front of you.
Check before you buy anywhere
Send David a certificate or quote from any seller and he will give you an honest opinion on the grade, the look and the price.
Ask David to compare the diamond with its IGI report line by line.
Yes. Lab-grown diamonds are real diamonds created in a laboratory using technology that replicates the conditions under which natural diamonds form deep within the Earth. Instead of taking billions of years, the process takes only a few weeks.
The result has the same crystal structure, brilliance and essential chemical and optical properties as a natural diamond. The key difference is its origin: one grows underground, while the other grows in a controlled laboratory.
Moissanite and cubic zirconia are different materials. If you want a diamond, ask for the IGI lab-grown diamond report.
Quote and certificate review
Already have a lab-grown diamond quote?
Send David the IGI certificate or quote. He will explain the grades, compare the value and tell you whether the option suits your budget — even if you do not buy from Diagem. This is a personal opinion, not a guarantee of price or availability.
“David is a very brilliant man- all in one. No middle man. #Diagem#Extremely satisfied.”
Christine Ganas · 5/5 on Google · 10 October 2026★★★★★
“Absolutely amazing experience dealing with David and his team. Short notice and he pulled it off. No hassle and no BS”
konrad myburgh · 5/5 on Google · 21 September 2026★★★★★
“Absolutely exceptional service. From first contact till delivery David went above and beyond to assist in creating something beautiful. Really recommend!”
Yes. Lab-grown diamonds are real diamonds created in a laboratory. They have the same crystal structure, brilliance and essential chemical and optical properties as natural diamonds. The difference is origin. They are not cubic zirconia or moissanite.
IGI or GIA: which certificate applies to a lab-grown diamond?
Diagem’s lab-grown diamonds are IGI-certified. GIA certification applies to Diagem’s natural diamonds. If you want a lab-grown diamond, ask for the IGI report.
What does a 1 carat or 2 carat lab-grown diamond cost in South Africa?
As a guide, 1ct lab-grown diamonds start from about R4,000 excl. VAT (R4,600 incl. VAT) and 2ct from about R7,000 excl. VAT (R8,050 incl. VAT) through Diagem. Guide prices only. Diamond prices and availability change. Ask David for current options and up-to-date prices. Prices are indicative and subject to exchange-rate changes. Confirm your final quote with David.
Can I buy a lab-grown diamond online from Diagem?
No. Diagem does not sell through an online checkout. Send David your shape, carat and budget, compare the IGI-certified options he sends, and decide when you are ready.
Can I view lab-grown diamonds in Johannesburg?
Yes, by appointment. Ask David what IGI-certified lab-grown diamonds are physically available to view and compare in Johannesburg.
Do you see clients in Cape Town or elsewhere in South Africa?
Johannesburg viewings are by appointment. Cape Town and other cities are by arrangement with David. Ask him what can be arranged for your enquiry.
Can I use a lab-grown diamond in an engagement ring?
Yes. Choose the IGI-certified diamond first, then discuss the ring style or a bespoke design made around that diamond and your budget.
Are IGI lab-grown diamonds worth it?
An IGI report tells you the carat, cut, colour, clarity and measurements you are paying for. David compares the report, the look of the diamond and the price so you can judge the value for your budget. Ask him before you buy anywhere.
Do lab-grown diamonds test as diamonds?
Lab-grown diamonds normally test as diamonds because they are diamonds. Specialised laboratory screening can identify laboratory origin, which is why the IGI report matters.
Do lab-grown diamonds become cloudy?
A properly graded lab-grown diamond should not become cloudy simply because it is lab-grown. Clarity, cut quality and care determine how it looks over time.
Already have a quote from somewhere else?
Send David the IGI certificate or quote on WhatsApp. He will explain the grades and tell you honestly whether the option suits your budget. This is a personal opinion, not a guarantee of price or availability.
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What Our Clients Say
Recent public Google reviews for Diagem Diamonds. These reviews do not claim to be about this specific page unless the reviewer says so.
★★★★★
“Experience was great. Excellent service.
Highly recommended.”
★★★★★
“Great place and great people very helpful and everything is top Quality”
★★★★★
“David is a very brilliant man- all in one. No middle man. #Diagem#Extremely satisfied.”
Send David your preferred shape, approximate carat, budget and whether you need a ring setting. He’ll help you compare IGI-certified options and arrange the next step when you’re ready.
