What Is a Lab-Grown Diamond? Everything South African Buyers Need to Know

Lab-grown diamonds are one of the most talked-about developments in fine jewellery over the past decade. If you are shopping for an engagement ring in South Africa, you have almost certainly come across them. You may have questions about whether they are real, whether they are worth buying, and how they compare to mined diamonds and moissanite.

This guide answers all of those questions directly. No marketing spin. No pressure toward one choice over another. Just the facts South African buyers need to make an informed decision.

What Exactly Is a Lab-Grown Diamond?

A lab-grown diamond is a real diamond. It has the same chemical composition as a mined diamond : pure carbon atoms arranged in a cubic crystal structure, the same physical properties, the same optical characteristics, and the same hardness rating of 10 on the Mohs scale. The only difference is where it was formed.

A mined diamond forms naturally beneath the earth's surface over billions of years under extreme heat and pressure. A lab-grown diamond replicates those conditions in a controlled laboratory environment and produces an identical stone in weeks rather than billions of years.

No gemologist, jeweller, or trained eye can tell the difference between a lab-grown and mined diamond by looking at it. The only way to distinguish them is with specialist equipment that detects the specific growth patterns formed during the laboratory process.

This matters because there is a persistent misconception that lab-grown diamonds are fake, synthetic, or somehow lesser. They are none of those things. They are chemically and physically identical to mined diamonds. The distinction is origin, not quality.

How Are Lab-Grown Diamonds Made?

There are two primary methods used to grow diamonds in a laboratory. Both produce real diamonds. They differ in process, cost, and the characteristics of the stones they produce.

HPHT: High Pressure High Temperature

HPHT replicates the natural conditions under which diamonds form in the earth. A small diamond seed is placed in a chamber and subjected to pressures of around 1.5 million pounds per square inch and temperatures above 1,400 degrees Celsius. Under those conditions, carbon dissolves into the seed and a diamond crystal grows around it.

HPHT is the older of the two methods. It produces diamonds with a slightly different crystal growth pattern to CVD diamonds, and HPHT stones sometimes carry a faint yellow or brown tint at lower colour grades. At the top colour grades, D, E, and F, this is not a concern.

CVD: Chemical Vapour Deposition

CVD is the more widely used method today. A diamond seed is placed in a chamber filled with carbon-rich gas, typically methane. The gas is ionised using microwave energy, which breaks down the molecular bonds and allows carbon atoms to deposit layer by layer onto the seed, growing a diamond crystal over several weeks.

CVD produces diamonds that are often very slightly different in structure from HPHT diamonds. Specialist equipment can distinguish between the two methods. Neither method produces a superior gemstone for engagement ring purposes. Both produce real, certifiable diamonds.

Are Lab-Grown Diamonds Certified?

Yes. Lab-grown diamonds are graded and certified by the same internationally recognised gemological laboratories that certify mined diamonds.

The two most trusted certifications for lab-grown diamonds in South Africa are IGI and GIA.

IGI (International Gemological Institute) is currently the most widely used certification body for lab-grown diamonds globally. IGI certificates grade the stone on the standard 4Cs: cut, colour, clarity, and carat weight. They are accepted by jewellers and buyers worldwide and are the standard you will see most often when shopping for a lab-grown diamond engagement ring in South Africa.

GIA (Gemological Institute of America) is the most prestigious gemological laboratory in the world and the originator of the 4Cs grading system. GIA began certifying lab-grown diamonds in 2019. A GIA certificate carries the highest level of prestige and independent verification. GIA-certified lab-grown diamonds typically carry a small price premium over IGI-certified stones of equivalent grade.

Any lab-grown diamond engagement ring you consider should come with one of these two certificates. Do not purchase a lab-grown diamond that comes only with an in-house certificate or no certificate at all.

Lab-Grown Diamond vs Mined Diamond: A Direct Comparison

The price difference is the most significant practical factor. A 1ct D colour, VS1 clarity, excellent cut lab-grown diamond in South Africa costs from R22,850 in a solitaire setting. The equivalent mined diamond would cost upward of R95,000. That is not a small difference. It is a fundamental shift in what is accessible at every budget level.

What Do the 4Cs Mean for Lab-Grown Diamonds?

The 4Cs apply to lab-grown diamonds exactly as they apply to mined diamonds. The grading system was developed by GIA and is the universal standard for evaluating diamond quality.

Cut

Cut is the most important of the four Cs. It determines how much light the stone captures, reflects, and returns to the eye. A well-cut diamond of moderate colour and clarity will outperform a poorly cut diamond of higher colour and clarity in terms of visual beauty.

For a round brilliant lab-grown diamond, look for Excellent or Very Good cut grade on the IGI certificate. For fancy shapes such as oval, pear, cushion, and emerald, cut quality is assessed by proportions rather than a formal cut grade. Ask your jeweller to help you assess the proportions on fancy shapes.

Colour

Diamond colour is graded on a scale from D (completely colourless) to Z (visibly yellow). For an engagement ring, D to G is the recommended range. D, E, and F are colourless. G is near-colourless and the slight warmth is invisible to the naked eye in most settings.

In yellow gold settings, a G or H colour grade is perfectly appropriate and often indistinguishable from a D colour stone once set. In white gold or platinum, D to F is preferable.

Clarity

Clarity refers to the presence of internal inclusions or surface blemishes. The scale runs from FL (flawless) through VVS1, VVS2, VS1, VS2, SI1, SI2, to I1, I2, I3.

For engagement rings, VS1 to VS2 is the sweet spot. The inclusions are not visible to the naked eye but the stone costs significantly less than a VVS or FL stone. SI1 can also be excellent value if the inclusions are positioned toward the edge of the stone where they will be covered by the prong setting.

Carat

Carat is the weight of the stone. One carat equals 0.2 grams. In practical terms, a 1ct round brilliant diamond measures approximately 6.5mm in diameter.

Because lab-grown diamonds are significantly less expensive than mined diamonds, many buyers choose a larger carat weight than they would have been able to afford in a mined stone. A buyer who might have purchased a 0.5ct mined diamond can comfortably consider a 1ct or 1.5ct lab-grown diamond at the same price point.

Lab-Grown Diamond Prices in South Africa: 2025

Prices for lab-grown diamonds in South Africa have continued to decrease over the past three years as production capacity has grown globally. This is both good and bad for buyers. Good because you get more stone for your money today than you would have in 2022. Potentially concerning if you are thinking about long-term resale value.

Here is what different budgets realistically buy in terms of a lab-grown diamond engagement ring in South Africa in 2025:

R15,000 to R25,000: A 0.5ct to 0.75ct lab-grown diamond solitaire in 9ct or 18ct gold, IGI certified, D-G colour, VS1-VS2 clarity. A genuinely beautiful, properly certified ring.

R25,000 to R45,000: A 1ct lab-grown diamond solitaire or a 0.75ct to 1ct in a halo setting. This is the most popular price range for lab-grown diamond engagement rings in South Africa currently.

R45,000 to R75,000: A 1.5ct to 2ct lab-grown diamond in a solitaire, or a 1ct in a more elaborate setting with pavé band and matching wedding ring. High-end presentation with premium stone size.

R75,000 to R120,000: A 2ct to 3ct lab-grown diamond in a premium setting. This tier delivers a stone size that would cost R300,000 or more in a mined diamond equivalent.

Compare these figures to our moissanite engagement rings, where a 1ct ring starts from R12,995 and a 2ct from R18,500. Both are beautiful, certifiable options. The right choice depends on what matters most to you.

The Resale Value Question

This is the most important practical consideration for lab-grown diamonds and one that many jewellers gloss over.

Lab-grown diamond prices have fallen dramatically since 2020 and the decline has not stopped. In 2020, a 1ct lab-grown diamond wholesale price was approximately 50 percent of a comparable mined diamond. Today it is closer to 15 to 20 percent. As production capacity continues to grow, further price compression is expected.

This means that if you purchased a lab-grown diamond engagement ring in 2022 and tried to sell it today, you would receive significantly less than you paid. The secondary market for lab-grown diamonds in South Africa is still developing and pricing is inconsistent.

If resale value matters to you, either choose a mined diamond or choose moissanite and do not think of either as an investment. Engagement rings are sentimental objects. Very few people sell them.

If you are buying a ring to wear for life and resale is irrelevant, the declining price of lab-grown diamonds is purely an advantage. You get a larger, better-graded stone for your money than at any previous point in history.

What to Tell People If They Ask

A common concern from buyers is what to say when friends or family ask about the ring. This is a South African social reality and worth addressing directly.

The honest answer is simple: it is a real diamond. It is chemically and physically identical to a mined diamond. It was grown in a laboratory rather than mined from the earth, which is how it is significantly more affordable. That is the complete truth and there is nothing to qualify or apologise for.

Most people who ask do so out of curiosity, not judgment. A confident, informed answer generally ends the conversation. The diamond on her finger is real. The ring is beautiful. That is what matters.

If you want to avoid the conversation entirely, moissanite is an even stronger choice in that regard. Moissanite is openly and proudly a different gemstone, not a diamond, so there is no comparison being made at all. Read our full moissanite vs lab diamond comparison to understand how the two stones differ and which suits different buyers better.

Is a Lab-Grown Diamond Right for You?

A lab-grown diamond is the right choice if a real diamond is important to you and your budget does not stretch to a mined diamond of the size and quality you want. It is a genuine, certified diamond at a fraction of the mined diamond price.

It may not be the right choice if long-term resale value is important to you, or if you want the absolute maximum brilliance per rand spent. Moissanite delivers more fire and brightness per rand than any diamond.

All of our lab diamond engagement rings are IGI certified, set in 9ct or 18ct gold or platinum, and made to order with a four to six week lead time. Every ring comes with a lifetime warranty and free nationwide delivery.

If you are considering a custom engagement ring, a lab-grown diamond gives you access to stone sizes and quality grades that would be out of reach in mined diamonds at most South African budgets. A fully custom 1.5ct D/VS1 lab-grown diamond ring in 18ct white gold is a realistic, accessible option for many buyers. The same ring in mined diamond would cost three to four times as much.

Browse our ring size guide if you are unsure about sizing, and contact us directly via WhatsApp for personalised advice before making any decision.

Frequently Asked Questions

Are lab-grown diamonds real diamonds?

Yes. Lab-grown diamonds are real diamonds. They have the same chemical composition , pure carbon in a cubic crystal structure, the same hardness of 10 on the Mohs scale, and the same optical properties as mined diamonds. The only difference is that they were formed in a laboratory rather than in the earth. No gemologist can distinguish them from mined diamonds with the naked eye.

How much does a lab-grown diamond engagement ring cost in South Africa?

A lab-grown diamond engagement ring in South Africa starts from approximately R22,850 for a 1ct round brilliant solitaire, IGI certified, D-G colour, VS1-VS2 clarity, in 9ct gold. A 1.5ct ring costs from R35,000 and a 2ct ring from R45,000. Prices vary based on cut quality, colour, clarity, and setting style.

What is the difference between IGI and GIA certification for lab-grown diamonds?

Both IGI and GIA are internationally recognised gemological laboratories that grade lab-grown diamonds on the 4Cs: cut, colour, clarity, and carat. GIA is considered the most prestigious and its certificates carry a slight premium. IGI is more widely used for lab-grown diamonds and its certificates are fully accepted by jewellers and buyers worldwide. Both are legitimate and trustworthy. Avoid any lab-grown diamond that comes only with an in-house certificate.

Do lab-grown diamonds hold their value?

Lab-grown diamond prices have fallen significantly since 2020 and continue to decline as production capacity grows globally. The resale market for lab-grown diamonds in South Africa is still developing, and resale values are considerably lower than purchase prices. If resale value is important to you, a mined diamond retains value better. Most engagement ring buyers do not plan to sell the ring, so this may not be a practical concern.

Can a jeweller tell if a diamond is lab-grown?

Not with the naked eye. A trained gemologist using specialist equipment, specifically a device that detects the growth characteristics of lab-grown diamonds, can identify a lab-grown stone. Standard jewellery loupes and microscopes cannot distinguish them from mined diamonds. Most high-street jewellers do not have this equipment.

What is better: a lab-grown diamond or moissanite?

Neither is objectively better. They suit different buyers. A lab-grown diamond is a real diamond and makes sense if having a diamond is important to you. Moissanite is a distinct gemstone with a higher refractive index than diamond, meaning it produces more brilliance and fire, and it costs significantly less per carat. A 1ct moissanite ring starts from R12,995 versus R22,850 for a comparable lab-grown diamond ring. Read our full comparison for a detailed breakdown.

How long does it take to make a lab-grown diamond ring in South Africa?

All our rings are made to order with a four to six week lead time from design approval. For a custom design, add one to two weeks for the consultation and CAD render process. If you have a specific proposal date in mind, order at least eight weeks in advance.

Is a lab-grown diamond a good choice for an engagement ring?

Yes, for most buyers. A lab-grown diamond is a real, certified diamond at a fraction of the cost of a mined stone. It is hard enough to wear every day for life, graded to international standards, and available in sizes and quality grades that most South African budgets could not reach in mined diamonds. The main caveat is resale value, which is low relative to purchase price. If the ring is being bought to be worn and kept, not resold, a lab-grown diamond is an excellent choice.