If you are weighing a lab-grown diamond against a mined one, you are asking the right question. Both are real diamonds, yet they differ in origin, price and resale in ways that matter to the decision.
This guide sets out the facts as they stand for an Australian buyer. We cover what the two actually are at a chemical level, whether the eye can tell them apart, how certification works, what you can expect to pay, how each holds value over time, and how to think about origin and environmental impact without overstating the case. Our aim is to help you choose with confidence, whichever way you lean.
Are lab-grown and natural diamonds the same thing?
In every way that defines a diamond, yes. A lab-grown diamond is chemically, physically and optically identical to a mined diamond. Both are pure crystallised carbon arranged in the same cubic lattice. They share the same hardness, the same refractive index, the same dispersion of light, and the same density. A lab-grown diamond is not a simulant such as cubic zirconia or moissanite, which are different materials that imitate the look of a diamond. It is a diamond, grown above ground rather than extracted from below it.
The single meaningful difference is where the carbon crystallised. A mined diamond formed deep in the earth over a very long period. A lab-grown diamond forms in a controlled environment over weeks, using one of two established methods. If you would like the full technical account, see our explainer on how lab-grown diamonds are made.
The two growth methods
There are two recognised ways to grow a diamond, and both produce genuine diamond crystal.
- High Pressure High Temperature (HPHT) recreates the conditions found deep within the earth, applying intense pressure and heat to a carbon source around a small diamond seed.
- Chemical Vapour Deposition (CVD) introduces a carbon-rich gas into a chamber, where carbon atoms settle layer by layer onto a seed and build a crystal.
Neither method is inherently superior. The cut, colour and clarity of the finished stone matter far more to its appearance than the method used to grow it. A well-cut CVD stone and a well-cut HPHT stone of the same grade will look the same in the hand. For a plain-language overview of the material itself, our page on what a lab-grown diamond is is a good starting point.
It is worth being precise about terminology here, because the words used in the market are not always consistent. A lab-grown diamond is sometimes described as laboratory-created or laboratory-grown. These all refer to the same thing. What they do not mean is a diamond simulant. A simulant such as cubic zirconia or moissanite is a separate material chosen to resemble a diamond at a glance, and it behaves differently under testing. When you are comparing options, the first question to settle is whether you are looking at a genuine diamond, mined or grown, or at a simulant. Once that is clear, the rest of the comparison follows.
Can anyone tell the difference?
Not with the naked eye, and not with a standard jeweller's loupe. Because the two are the same material, they show the same brilliance, fire and scintillation. There is no visual cue that separates a well-cut lab-grown diamond from a well-cut mined one of the same grade.
The distinction can be drawn in a specialist gemmological laboratory, using equipment that reads the subtle trace patterns left by how the crystal formed. This is precisely why independent certification exists, and why every reputable lab-grown diamond is graded and recorded. The point is not that the two look different. It is that the origin can be verified and documented, so nothing is left to assumption.
This matters for an Australian buyer in a practical sense. Because the two are indistinguishable to the eye, the value of buying from a transparent source lies in the paperwork, not in any visible feature of the stone. A diamond sold without a clear origin statement leaves you relying on trust alone. A diamond sold with an independent report and a stated origin lets you verify exactly what you have. That is the standard we hold to, and it is the standard we would encourage you to expect from anyone, regardless of where you buy.
How certification works
Certification is where transparency is earned. A diamond certificate, sometimes called a grading report, is an independent assessment of a stone against the recognised criteria of cut, colour, clarity and carat weight, along with measurements and any treatment or origin notes.
Every CRTD diamond is independently certified by IGI, GIA or an equivalent laboratory. The certificate states clearly that the stone is lab-grown, so there is no ambiguity about what you are buying. Reputable lab-grown diamonds carry the same depth of grading as mined diamonds, and many are laser-inscribed with a report number you can match to the paperwork.
A few points worth knowing as an Australian buyer:
- The certificate should be independent. A grading report from a recognised third-party laboratory carries more weight than an in-house assessment.
- Look for the origin statement. A proper report identifies the stone as laboratory-grown. Under Australian Consumer Law, this should always be disclosed plainly.
- Match the inscription. Where a stone is laser-inscribed, the number on the girdle should match the report.
We hold to a minimum clarity of VS1 across our range, and we source every stone to order against the specification you choose. You can read more about that process on our how we source page.
What you can expect to pay
Price is where the two diverge most clearly. For a stone of comparable cut, colour, clarity and carat weight, a lab-grown diamond typically costs substantially less than a mined diamond, commonly in the order of 60 to 80 percent less. The exact figure moves with the market, the grade and the size, but the direction is consistent.
The reason is supply rather than quality. A lab-grown diamond can be produced to a known specification in weeks, without the cost of extraction. That efficiency is passed on in the price. It does not make the diamond lesser. It makes the same grade of stone available at a more accessible figure, which is why many buyers choose to put the difference towards a larger or higher-graded stone, or simply keep it.
It is worth comparing like with like. A lab-grown diamond at a given set of grades should be measured against a mined diamond at the same grades, not against a lower one. When you do that, the value position is straightforward and easy to verify against any certificate.
The same logic applies to the four characteristics that drive any diamond's price, often called the four Cs.
- Cut shapes how light moves through the stone and is the single greatest influence on how it presents. A well-cut diamond of either origin shows more brilliance than a poorly cut one of a higher colour grade.
- Colour describes how near-colourless a white diamond is. The scale runs the same way for lab-grown and mined stones.
- Clarity records the presence of inclusions. We hold to a minimum of VS1, which means inclusions are not visible to the unaided eye.
- Carat is the weight of the stone, and price rises with size for both origins.
Because these characteristics are graded identically across both categories, a certificate gives you a level basis for comparison. The price difference you see between a lab-grown and a mined stone of the same four Cs reflects supply, not a difference in what the grades describe.
The honest position on resale
This is the trade-off that deserves a plain answer. Lab-grown diamonds generally hold less resale value than mined diamonds, and as a category they are relatively new, so a mature secondary market is still developing. If your primary goal is a stone that retains a high resale figure or functions as a financial asset, a mined diamond has the longer track record.
Two things are worth keeping in perspective. First, diamonds of either kind are rarely strong investments. The retail price of any diamond, mined or lab-grown, is typically well above what it would fetch on resale, so the gap is a question of degree rather than a feature unique to lab-grown stones. Second, the lower entry price of a lab-grown diamond means there is less outlay to begin with. Whether resale matters to you depends entirely on why you are buying. For a piece you intend to keep and wear, it may not weigh heavily at all. We would rather you knew this clearly than discovered it later.
Origin, ethics and environmental impact
Because a lab-grown diamond is grown in a controlled facility, its supply chain is short and traceable. There is no mining, no land disruption from extraction, and no ambiguity about where the carbon came from. For buyers who care about provenance, that traceability is a genuine and verifiable benefit.
On the environmental question, it is fair to say that lab-grown diamonds avoid the land and water impact associated with mining. It would not be accurate to claim they have no footprint. Growing a diamond uses energy, and the size of that footprint depends on how the facility is powered. The honest framing is lower impact per carat in several respects, stated factually, not zero impact. We prefer to give you the defensible version rather than the marketing one.
For some buyers, the ethics of provenance are the deciding factor. Mined diamonds vary widely by source, and a responsible mined-diamond supply chain can be traced and documented, though doing so takes effort and the chain is longer. A lab-grown diamond shortens that chain considerably because the stone is grown rather than extracted, and its journey from facility to finished piece is easier to follow. Neither origin is automatically more ethical in every respect, but the traceability of a grown stone is concrete and verifiable. If provenance is central to your decision, our how we source page sets out the steps we take and the certification we require.
A side-by-side comparison
| Factor | Lab-grown diamond | Natural (mined) diamond |
|---|---|---|
| Composition | Pure crystallised carbon, identical lattice and properties | Pure crystallised carbon, identical lattice and properties |
| Appearance | Same brilliance, fire and scintillation; indistinguishable to the eye | Same brilliance, fire and scintillation; indistinguishable to the eye |
| Price | Typically 60 to 80 percent less for a comparable grade | Higher for the same cut, colour, clarity and carat |
| Certification | Independently graded (IGI, GIA or equivalent), origin disclosed | Independently graded (IGI, GIA or equivalent) |
| Resale | Generally lower; secondary market still developing | Generally higher; longer established secondary market |
| Origin and ethics | Short, traceable supply chain; no mining or land disruption | Extracted; provenance varies by source and supply chain |
How buying works at CRTD
One difference worth understanding is how the stone reaches you. Rather than holding a large standing inventory, we work on a sourced-to-order model. You choose the cut, carat, colour and clarity you want, and we source a certified stone to match that specification. This keeps the range broad without the cost of carrying every combination on a shelf, and it means the diamond you receive is selected against your brief rather than the nearest available substitute.
In practice that involves a short lead time while the stone is sourced and its certification confirmed. Every stone is independently graded, inspected before dispatch, and sent by insured courier from Sydney. Because the model is built around your specification, it suits buyers who know roughly what they want and would rather have the right stone than the quickest one. If you are unsure where to start, we are happy to talk through the grades and what they mean for your piece and your figure.
So which should you choose?
There is no single right answer, only the answer that fits your priorities. A lab-grown diamond suits a buyer who wants a certified, traceable stone of a chosen grade at a more accessible price, and who values the piece for what it is rather than what it might resell for. A mined diamond suits a buyer who places weight on the longer resale history and the particular meaning of a stone formed over geological time.
Both are real diamonds. Both can be independently certified. The choice comes down to price, resale and provenance, set against what the piece means to you. Whichever way you go, insist on independent certification and a clear origin statement, and compare grade for grade.
Frequently asked questions
Are lab-grown diamonds real diamonds?
Yes. A lab-grown diamond is real crystallised carbon with the same chemical, physical and optical properties as a mined diamond. It is not a simulant such as cubic zirconia or moissanite, which are different materials made to look like a diamond.
Will a jeweller be able to tell it is lab-grown?
Not by eye or with a standard loupe, because the material is identical. The origin can be confirmed in a specialist gemmological laboratory, which is why every stone we sell is independently certified and the lab-grown origin is stated plainly on the report.
Why are lab-grown diamonds less expensive?
The difference is supply, not quality. A lab-grown diamond can be produced to a known specification in weeks without the cost of extraction, and that efficiency is reflected in the price. For a comparable grade, the saving is commonly in the order of 60 to 80 percent.
Do lab-grown diamonds hold their value?
Generally they hold less resale value than mined diamonds, and the secondary market is still developing. It is worth noting that diamonds of either kind rarely make strong financial investments, so for a piece you intend to keep and wear this may matter little. We think it is better to know this up front.
Explore the collection
Every CRTD diamond is independently certified, sourced to order against the specification you choose, and dispatched by insured courier from Sydney. If you would like to see what is available, browse our full diamond collection, or contact us for guidance on choosing the right stone for your piece.