A lab-grown diamond is a real diamond. Not a replica, not an imitation, not a diamond alternative — a diamond. The same carbon atoms arranged in the same crystal structure, graded by the same independent gemological laboratories, and rated at 10 on the Mohs hardness scale, the highest possible score for any mineral on Earth.
The only thing that distinguishes a lab-grown diamond from a mined one is where it formed. One formed in the Earth over billions of years. The other grew in a controlled laboratory environment over a matter of weeks, using technology that replicates the same extreme conditions responsible for natural diamond formation.
The question that follows is almost always the same: how exactly does that work? This guide explains the science plainly, addresses the most common misconceptions, and gives you everything you need to understand what lab-grown diamonds actually are — and why they have become the choice of a new generation of buyers.
What Is a Lab-Grown Diamond?
A lab-grown diamond is a diamond composed of pure carbon arranged in the cubic crystal structure that defines all diamonds. It shares identical chemical, physical, and optical properties with a mined diamond. Both score 10 on the Mohs hardness scale — harder than any other natural material. Both refract light in the same way. Both are graded using the same 4Cs framework: cut, colour, clarity, and carat weight.
When the Federal Trade Commission in the United States and the International Gemological Institute expanded their definitions of “diamond” to include lab-grown stones, it was a formal recognition of what scientists had known for decades: that a lab-grown diamond and a mined diamond are the same thing, with different origin stories.
What lab-grown diamonds are not is equally important to understand. They are not cubic zirconia, which is made from zirconium dioxide — an entirely different material. They are not moissanite, which is composed of silicon carbide. They are not coatings, treatments, or simulants of any kind. A lab-grown diamond contains no other material. It is carbon, crystallised. A diamond.
How a CVD Diamond Is Grown
Chemical Vapour Deposition, or CVD, is the method used to grow most gem-quality lab-grown diamonds today. The process begins with a diamond seed — a thin slice of an existing diamond, approximately one millimetre across — which is placed inside a sealed chamber.
The chamber is then filled with a carbon-rich gas mixture, typically methane combined with hydrogen, and heated to temperatures of around 700 to 1,300 degrees Celsius. At those temperatures, the gas ionises into a plasma state. The carbon molecules in the plasma break apart and the freed carbon atoms settle onto the diamond seed, building new crystal layers one atom at a time.
Over three to four weeks, those layers accumulate into a rough diamond crystal. The process is slow, deliberate, and controlled — but that is precisely what makes it effective. The resulting stone has the same atomic structure as a diamond that formed 150 kilometres below the Earth’s surface over billions of years. CVD simply shortens that timeline considerably.
After growth, the rough stone is cut, shaped, and polished using the same techniques and equipment applied to mined rough diamonds. A skilled cutter works to maximise the stone’s light return, arriving at the brilliant, faceted diamond that ends up in a ring.
How an HPHT Diamond Is Grown
High Pressure High Temperature, or HPHT, is the older of the two methods and, as the name suggests, it works by replicating the exact physical conditions that produce natural diamonds deep within the Earth.
A diamond seed is placed inside a specially designed mechanical press alongside carbon-rich material. The press subjects everything inside to temperatures of around 1,300 to 1,600 degrees Celsius and pressures in the range of 5 to 6 gigapascals — roughly equivalent to 870,000 pounds per square inch, or the weight of a commercial aircraft balanced on a thumbnail. Under those conditions, the carbon melts and crystallises around the seed, forming a diamond.
Metal catalysts, typically iron, nickel, or cobalt, are added to facilitate the crystallisation process, acting as a solvent that helps the carbon atoms find their way into the growing crystal structure. The press operates in a carefully controlled environment to ensure the temperature and pressure remain uniform throughout the growth period, which takes anywhere from a few days to several weeks depending on the size of the stone being produced.
HPHT diamonds are commonly identified by their distinctive cubic or cubo-octahedral shape as rough crystals, and often display a slight yellowish tint from the metal catalysts used during growth. That tint is removed through post-growth treatment, and the finished, cut stone is graded on the same colour scale applied to all diamonds.
How Long Does It Take to Grow a Lab-Grown Diamond?
Growing a one-carat lab-grown diamond typically takes between three and four weeks from seed to rough crystal, depending on the method and the size of the target stone. Larger stones take proportionally longer — a two-carat rough may take six to eight weeks. Compared to the billions of years required to produce a natural diamond, the timeline is remarkable.
It is also worth understanding that the process, though far faster than natural formation, is not effortless. Growing a gem-quality diamond requires precise temperature control, specialised equipment, and significant energy input. The reason lab-grown diamonds are more accessible in price than mined diamonds is not that they are simple to produce — it is that the supply chain is shorter, more transparent, and not subject to the costs and logistics of deep-earth mining operations.
Is a Lab-Grown Diamond a Real Diamond?
Yes. Unconditionally and without qualification.
A trained gemologist examining a lab-grown diamond and a mined diamond side by side cannot distinguish between them using standard equipment. Specialist laboratory instruments — the same kind used by the GIA and IGI to confirm a stone’s origin — can detect microscopic differences in growth patterns and trace element signatures. But to the naked eye, to standard gemological tools, and to every practical measure of quality, durability, and beauty, a lab-grown diamond is a diamond.
The question often arises from an association with other lab-created gemstones — cubic zirconia and moissanite, in particular — which look like diamonds but are made of fundamentally different materials. Those are diamond simulants: stones that resemble diamonds but do not share their chemical or physical properties. A lab-grown diamond shares both.
Major gemological institutions including the GIA, IGI, and the Gemological Association of Australia all classify lab-grown diamonds as diamonds, not as simulants. Every lab-grown diamond at The Jewel Concierge carries a full certificate from either IGI or GIA, graded on the same criteria — cut, colour, clarity, and carat — applied to every other diamond those institutions evaluate.
How Lab-Grown Diamonds Are Graded
Lab-grown diamonds are graded using exactly the same 4Cs framework applied to all diamonds: cut, colour, clarity, and carat weight.
Cut refers to how well the stone’s facets have been proportioned and polished to interact with light. A well-cut diamond — whether lab-grown or mined — returns maximum brilliance and fire. Cut has the greatest single influence on how a diamond looks.
Colour is graded on a scale from D (colourless) to Z (light yellow or brown). The closer to D, the less colour the stone shows and the more valuable and visually clean it appears. At The Jewel Concierge, all lab-grown diamonds are D to F colour — the top three grades on that scale.
Clarity refers to the presence of internal inclusions or surface blemishes. Most diamonds, lab-grown and mined alike, form with some imperfections. The clarity scale runs from Flawless at the top to Included at the bottom. A lab-grown diamond does not automatically have better clarity than a mined diamond — inclusions can form in both growing environments. The Jewel Concierge sources VS2 to VVS1+ clarity grades, meaning any inclusions are minor and not visible to the naked eye.
Carat measures weight, not size. One carat equals 0.2 grams. Because lab-grown and mined diamonds share the same density, a one-carat lab-grown diamond and a one-carat mined diamond are physically the same size.
The certificate that accompanies a lab-grown diamond records all four of these grades independently, verified by trained graders who do not know the stone’s origin at the time of assessment. The grade is the grade.
Lab-Grown vs Mined Diamonds: What Is Actually Different
The differences between lab-grown and mined diamonds are fewer than most people expect. The significant ones are worth stating plainly.
Origin. A mined diamond formed over billions of years under the Earth’s mantle. A lab-grown diamond formed over weeks in a laboratory. This is the primary distinction, and it is one of origin rather than composition.
Price. Lab-grown diamonds are significantly more accessible in price than mined diamonds of equivalent quality. The price difference reflects the supply chain — not the stone. A lab-grown diamond and a mined diamond of the same cut, colour, clarity, and carat will look identical. The lab-grown option simply costs less, which means you can often choose a larger stone, a higher clarity grade, or a more detailed setting within the same budget.
Environmental impact. Diamond mining involves large-scale land excavation, significant water use, and energy-intensive logistics. Lab-grown production requires energy but leaves no land disruption. All diamonds at The Jewel Concierge are certified carbon neutral, reflecting our commitment to minimising environmental footprint across the full production process.
Traceability. A lab-grown diamond comes with complete supply chain transparency. You know the growing facility, the method, and the date of production. The sourcing history of a mined diamond, particularly an older or pre-owned stone, often remains unclear or incomplete.
Resale value. This point deserves honesty. Neither lab-grown nor mined diamonds are reliable financial investments. The secondary market for all diamonds is illiquid and unpredictable. The value of an engagement ring is not primarily financial — it is sentimental and personal. On that measure, a lab-grown diamond carries exactly the same meaning as a mined one.
Lab-Grown Diamonds vs Moissanite and Cubic Zirconia
This is a distinction worth making clearly, because some buyers confuse the three.
Cubic zirconia (CZ) is made from zirconium dioxide. It scores 8 to 8.5 on the Mohs hardness scale and has a higher refractive index than diamond, which gives it a distinctive rainbow-like dispersion that experienced eyes can usually detect. CZ is not a diamond, does not have diamond’s durability, and will show wear and cloudiness over time.
Moissanite is composed of silicon carbide, a naturally occurring mineral first discovered in a meteorite crater in 1893. Lab-grown moissanite is now widely used in jewellery as a diamond alternative. It scores 9.25 on the Mohs hardness scale — harder than CZ but softer than diamond — and also produces more fire and colour dispersion than diamond, which some buyers appreciate and others find less appealing. Moissanite is not a diamond. It is a beautiful stone in its own right, but a fundamentally different material.
A lab-grown diamond is none of these things. It is composed of pure carbon in the cubic crystal structure that defines all diamonds. It is physically, chemically, and optically identical to a mined diamond. It requires the same care, cuts in the same way, and holds its appearance for the same lifetime. The only meaningful difference between a lab-grown diamond and a mined diamond is where it came from.
Why Australian Couples Are Choosing Lab-Grown Diamonds
Australia is one of the strongest markets globally for lab-grown diamond adoption, and the reasons are consistent across the couples who make that choice.
Transparency matters. A generation of buyers who have grown up questioning supply chains, sourcing practices, and environmental claims are applying the same scrutiny to what they put on their fingers. A lab-grown diamond offers complete traceability in a way that mined diamonds rarely can.
Value matters too. The same budget that once produced a modest mined diamond can now produce a significantly larger or higher-quality lab-grown stone. For couples spending meaningful money on a ring, the ability to direct more of that budget toward the diamond itself — rather than toward the costs embedded in mining supply chains — is a straightforward advantage.
And the stone itself matters. A lab-grown diamond is not a compromise. It is the same material, the same hardness, the same brilliance, grown in a different place. Couples who choose lab-grown diamonds do so because they have understood what they are choosing — not because they have accepted something lesser.
Frequently Asked Questions
Are lab-grown diamonds the same as real diamonds?
Yes. Lab-grown diamonds are chemically, physically, and optically identical to mined diamonds. They are made of pure carbon in the same crystal structure, score 10 on the Mohs hardness scale, and are graded by the same independent gemological laboratories using the same criteria. The only difference is origin.
Can anyone tell the difference between a lab-grown and a mined diamond?
Not without specialist laboratory equipment. A trained gemologist cannot distinguish between the two using standard tools. Specialist instruments can detect microscopic differences in growth patterns, but to the naked eye and to every practical measure of appearance and durability, the two are indistinguishable.
What is the difference between CVD and HPHT lab-grown diamonds?
CVD (Chemical Vapour Deposition) grows diamonds by breaking down carbon-rich gas inside a sealed chamber, depositing carbon atoms layer by layer onto a seed crystal. HPHT (High Pressure High Temperature) replicates the extreme heat and pressure found in the Earth’s mantle to crystallise carbon around a seed. Both methods produce real diamonds graded on the same 4Cs scale. The method of growth does not meaningfully affect the quality or appearance of the finished stone.
How long does it take to grow a lab-grown diamond?
A one-carat lab-grown diamond typically takes three to four weeks to grow from seed to rough crystal. Larger stones take longer. In comparison, natural diamonds took billions of years to form. The process is fast relative to nature, but not instantaneous — growing a gem-quality diamond requires precise conditions, significant energy, and skilled oversight throughout the growing period.
Are lab-grown diamonds a good investment?
Neither lab-grown nor mined diamonds should be purchased as financial investments. The secondary market for all diamonds is unpredictable, and resale values for both are generally lower than retail purchase prices. What lab-grown diamonds offer is better value at the time of purchase: more diamond for the same budget, with the added confidence of ethical sourcing and transparent origins.
What is the difference between a lab-grown diamond and moissanite?
A lab-grown diamond is pure carbon crystallised in the same structure as a mined diamond. Moissanite is composed of silicon carbide — a different material entirely. Both are used in fine jewellery, but they are not the same stone. Moissanite has a higher fire (colour dispersion) than diamond and a slightly lower hardness. A lab-grown diamond and a mined diamond are the same material with different origins. A lab-grown diamond and moissanite are different materials entirely.
Do lab-grown diamonds have inclusions?
Yes. Lab-grown diamonds can and do form with inclusions, just as mined diamonds do. The growing process is not perfect, and imperfections can develop during crystal formation. This is actually further evidence that lab-grown diamonds are real diamonds — the same imperfect growth process that produces inclusions in natural stones also produces them in controlled laboratory environments. A diamond grown without any inclusions at all would be exceptionally rare, whether grown underground or in a laboratory.
The Diamond That Fits How You Think About Luxury
A lab-grown diamond is not a product designed to fool anyone. It does not pretend to be something it is not. It is a diamond — grown in a different place, by a different process, in a fraction of the time, with a supply chain you can understand and verify.
For couples who care about where things come from, what they are made of, and what their purchase reflects about their values, that is not a small thing. It is the whole point.
Explore our full collection of lab-grown diamond engagement rings, or read our complete buyers guide for practical guidance on choosing the right stone and setting. If you would prefer a one-to-one conversation, the Bespoke Journey is the starting point for a ring designed entirely around you.
