If you’re shopping for an engagement ring and considering a lab-grown option, you’ve probably asked yourself: are lab grown diamonds real diamonds? It’s one of the most common questions we hear at A Star Diamonds, and the confusion is understandable. There’s a lot of conflicting information out there, some of it outdated, some of it flat-out wrong, and when you’re making a purchase this meaningful, you deserve a straight answer.

The short answer is yes. Lab-grown diamonds are real diamonds. They share the same chemical composition, crystal structure, and optical properties as diamonds formed underground over billions of years. The difference lies in origin, not identity. A gemologist can’t tell them apart with the naked eye, and even specialist equipment looks for growth indicators rather than any material difference between the two.

At A Star Diamonds in Hatton Garden, we work with both natural and lab-grown diamonds every day. Our gemologists and goldsmiths guide clients through this exact decision as part of our bespoke engagement ring process, so we know the real questions people have, and where the myths tend to creep in. This article breaks down the facts about lab-grown diamonds, what makes them identical to mined stones, where they genuinely differ, and what that means for you if you’re weighing up your options.

Why lab-grown diamonds count as real diamonds

When people ask are lab grown diamonds real diamonds, they’re usually wondering whether a lab-grown stone is somehow lesser, a fake, or an imitation. It isn’t. A lab-grown diamond is composed entirely of carbon atoms arranged in the exact same cubic crystal structure as a mined diamond. That structure is what gives diamond its defining properties: extraordinary hardness, exceptional light refraction, and the brilliance you see when a stone catches the light. No other material replicates all of these simultaneously, which is why lab-grown diamonds are classified as diamonds and not simulants like cubic zirconia or moissanite.

A diamond simulant looks similar to a diamond but has a completely different chemical composition. A lab-grown diamond, by contrast, shares the exact same composition as a natural mined diamond, carbon for carbon.

The chemistry is identical

Carbon is carbon, regardless of whether it crystallised beneath the Earth’s surface over billions of years or inside a controlled growth chamber over several weeks. The chemical formula for a diamond is simply C, meaning it consists of pure carbon bonded in a specific lattice arrangement, and that applies equally to both natural and lab-grown stones. The hardness rating is the same: a 10 on the Mohs scale, the highest possible score, and a direct result of how tightly those carbon atoms bond together under extreme pressure and heat.

This matters because it means lab-grown diamonds carry every physical property you associate with a mined diamond. They scratch the same materials, conduct heat in the same way, and respond to light identically. When you hold a lab-grown diamond next to a natural one of equivalent cut and quality, there is no practical difference in how they look or behave.

What gemologists actually see

Standard gemological tools cannot distinguish between a lab-grown diamond and a natural one based on appearance alone. A loupe, a microscope, or a refractometer will return the same readings for both. What specialist equipment does detect are growth characteristics specific to each formation process, such as particular types of inclusions or internal strain patterns. These are markers of origin, not indicators of quality or authenticity.

Professional gemologists with access to advanced spectroscopic equipment, including those at the Gemological Institute of America (GIA), can identify whether a diamond formed underground or in a laboratory by analysing these growth patterns. However, that process is purely about tracing provenance. Both types pass the same fundamental diamond tests because they are, in every material sense, the same thing. The origin changes; the substance does not.

Certification confirms their status

Major grading laboratories, including the GIA and the International Gemological Institute (IGI), issue full diamond grading reports for lab-grown stones. These certificates assess the same four criteria applied to natural diamonds: cut, colour, clarity, and carat weight. The grading methodology is identical because the stones respond the same way under examination.

When you purchase a lab-grown diamond from a reputable jeweller, you receive documentation that holds the stone to the same professional standard as any mined diamond. The certificate does not mark it as a lesser category. It grades it as a diamond, with the same rigour and the same criteria. That certification matters when you’re spending a significant amount on something that represents a lasting commitment, and it gives you a straightforward, verifiable record of exactly what you’re buying.

How lab-grown diamonds are made

Understanding the production process helps clarify exactly why are lab grown diamonds real diamonds gets such a definitive yes as its answer. Two principal methods exist for growing diamonds in a laboratory setting: High Pressure High Temperature (HPHT) and Chemical Vapour Deposition (CVD). Both replicate the conditions that cause carbon to crystallise into diamond form, but they do so through different technical approaches. Knowing how each works gives you a clearer picture of what you’re buying and why the result is a genuine diamond in every material sense.

High Pressure High Temperature (HPHT)

HPHT was the first method developed for growing diamonds, and it closely mirrors the natural geological process that creates mined stones. A small diamond seed is placed alongside a carbon source inside a growth chamber, then subjected to temperatures exceeding 1,400°C and pressures above 1.5 million pounds per square inch. Under these extreme conditions, the carbon melts and begins to crystallise around the seed, gradually forming the diamond structure layer by layer over a period of several days to a few weeks.

HPHT was originally developed for industrial purposes, but advances in the technology have made it fully capable of producing gem-quality diamonds suitable for fine jewellery.

The rough stones produced through HPHT typically display a blocky or cubic crystal shape, which influences how a skilled cutter approaches the raw material. The size of the intended finished stone determines how long the growth cycle runs, and larger target carat weights require proportionally longer growth periods inside the chamber.

Chemical Vapour Deposition (CVD)

CVD operates through a different mechanism and has become the more widely used approach for producing gem-quality diamonds for the jewellery market. A thin diamond seed plate sits inside a sealed chamber filled with carbon-rich gases, most commonly methane. Microwave or radio-frequency energy breaks down these gas molecules, releasing carbon atoms that settle onto the seed and bond in the same crystalline lattice arrangement as a natural diamond.

This method gives growers greater control over the growth environment, which lets them influence characteristics like colour and internal clarity more precisely than HPHT allows. CVD operates at lower pressures, though it still demands specialist equipment and significant technical expertise to produce high-quality results. Once the rough stone is grown, it goes through the same cutting, polishing, and independent grading process as any mined diamond before arriving at a jeweller.

Lab-grown vs natural: what actually differs

Now that you understand why are lab grown diamonds real diamonds gets a clear yes, it helps to look honestly at where these two types of diamond genuinely do differ. The differences aren’t about quality or authenticity, but they do affect price, rarity, and long-term resale value, and understanding each one will help you make a decision you feel genuinely confident about.

Price and what drives it

The most immediate difference you’ll notice is cost. Lab-grown diamonds consistently sell for significantly less than natural diamonds of comparable cut, colour, clarity, and carat weight. The reason is straightforward: natural diamonds took billions of years to form under specific geological conditions, making them finite and costly to mine. Lab-grown diamonds can be produced in weeks using scalable technology, which reduces the cost of supply considerably.

This price gap has widened as production technology has improved, meaning you can often purchase a larger or higher-quality lab-grown stone for the same budget you’d spend on a smaller natural diamond.

For a bespoke engagement ring, that price difference is significant. You may be able to prioritise a better cut grade or a higher colour rating with a lab-grown stone without stretching your budget beyond what’s comfortable.

Rarity and resale value

Natural diamonds are finite. Each one formed under unique geological conditions over an enormous timescale, and that scarcity is part of what has traditionally sustained their value in secondary markets. Lab-grown diamonds don’t carry that same scarcity, and as a result, their resale value sits considerably lower than natural diamonds at comparable grades. If you plan to resell or upgrade your stone in future, this is worth factoring into your decision.

Most engagement rings, however, are kept rather than sold. If your priority is a visually excellent diamond at a price that suits your circumstances, the resale consideration may carry little practical weight for you.

What the grading certificate records

Both natural and lab-grown diamonds receive grading reports from independent laboratories such as the GIA or IGI, and both are assessed against the same four criteria: cut, colour, clarity, and carat weight. The difference you’ll see on the certificate is a notation indicating the stone’s origin, either "natural" or "laboratory-grown." That notation does not affect the grade itself; it simply records where the diamond came from, giving you full transparency about what you’re purchasing.

Common myths and straight answers

Several persistent misconceptions surround lab-grown diamonds, and they tend to surface whenever someone starts researching their options. Separating fact from fiction early saves you from making a decision based on outdated information, so here are the myths you’re most likely to encounter and what the evidence actually says about each one.

"Lab-grown diamonds are just simulants"

This is the most widespread misunderstanding, and it conflates two completely different things. Simulants like cubic zirconia or moissanite look similar to diamond but are composed of entirely different materials. A lab-grown diamond is composed of pure carbon in the same crystalline structure as a mined stone. When people ask are lab grown diamonds real diamonds, this confusion is often the root of their doubt, and the answer remains the same: a lab-grown diamond is a diamond, not an imitation.

The distinction matters because simulants behave differently under gemological testing, while lab-grown diamonds return the same results as natural diamonds across every standard measure.

"You can tell the difference by looking"

No untrained eye can distinguish a lab-grown diamond from a natural one by sight alone. Even trained gemologists using standard equipment cannot tell them apart without specialist spectroscopic analysis, and that analysis looks for growth characteristics, not material differences. If someone claims they can spot a lab-grown stone visually, they are mistaken.

Both types produce the same brilliance and fire in a well-cut stone. The cut quality influences what you see far more than the origin of the diamond ever will.

"Lab-grown diamonds aren’t durable"

This myth likely stems from general scepticism about anything described as synthetic. In reality, a lab-grown diamond scores a 10 on the Mohs hardness scale, which is identical to a natural diamond and the highest rating any material can achieve. It scratches glass, resists chips from everyday wear, and holds up to the same conditions as any mined stone of equivalent quality.

Durability is a product of the diamond’s atomic structure, and that structure is the same whether the stone grew underground or inside a growth chamber. You don’t need to treat a lab-grown diamond differently, clean it differently, or worry about it wearing down faster. It performs exactly as you’d expect a diamond to perform because that is precisely what it is.

How to buy a lab-grown diamond with confidence

Once you’re satisfied that are lab grown diamonds real diamonds has a clear answer, the practical question becomes how to buy one without second-guessing your decision afterwards. Buying a lab-grown diamond follows the same logic as buying any high-value gemstone: you need verifiable information, a trustworthy source, and a clear understanding of what the grading criteria mean for the stone you’re considering.

Insist on an independent grading certificate

Every lab-grown diamond worth purchasing comes with a grading report from an independent laboratory such as the GIA or the IGI. This document is not a marketing tool; it’s an objective record of the stone’s cut, colour, clarity, and carat weight, assessed by gemologists with no commercial interest in the sale. A retailer who cannot provide a certificate for a lab-grown stone is a retailer to avoid.

A certificate from a recognised grading laboratory gives you a factual baseline that no sales conversation can substitute for, and it protects your purchase if you ever need to insure, upgrade, or appraise the stone.

Read the certificate before you agree to anything. Check the clarity grade, the colour grade, and the cut grade independently, and compare them against the price you’re being quoted. If a retailer pressures you to decide without reviewing the paperwork, that is a warning sign.

Understand how the 4Cs affect what you actually see

Cut is the factor that affects visual impact most directly, regardless of whether you choose a lab-grown or natural stone. A well-cut diamond reflects light through the crown efficiently, producing the brightness and sparkle that makes a ring stand out. A poorly cut stone with an excellent colour grade will still look flat.

Colour and clarity both influence price significantly, but minor variations within adjacent grades are often invisible to the naked eye in mounted settings. If your budget is a consideration, a stone graded G in colour rather than D, or VS2 in clarity rather than VVS1, will almost certainly look identical once set in a ring. Prioritising cut over the other three criteria consistently produces the best visible result for your money.

Work with specialists who guide rather than sell

A jeweller who asks what matters to you before discussing price is one worth trusting. At A Star Diamonds, our gemologists and goldsmiths walk you through every element of the selection process in person, helping you understand exactly what you’re comparing before you commit to anything.

Final checks before you choose

Before you commit, run through a short checklist. Confirm the stone comes with a grading certificate from the GIA or IGI, and review the cut, colour, and clarity grades carefully. If you’re still asking yourself are lab grown diamonds real diamonds, the answer hasn’t changed: they are, in every chemical and physical sense, genuine diamonds.

Your budget, priorities, and what you want the ring to represent should drive the decision, not misconceptions. A lab-grown diamond gives you the same hardness, brilliance, and certification as a mined stone at a noticeably lower price point. A natural diamond offers finite rarity that some buyers place real personal value on. Neither choice is wrong, and both result in a real diamond.

When you’re ready to talk through your options with people who know diamonds in depth, book a consultation at A Star Diamonds and get expert guidance tailored to your specific priorities from a team that works with both stone types every day.