Two diamonds can sit side by side under the same lamp, take the same grades on the same scale, and differ in price by half. One grew in the earth over a geological timescale. The other grew in a chamber over a few weeks. Everything else about them – the material, the hardness, the way they handle light – is the same.
That is the whole of it, and yet the choice still trips people up, because the differences that do exist are commercial and personal rather than physical. This guide sets out what is actually true about both, so you can decide which one you are buying and why.
A lab-grown diamond is a diamond
This is worth stating plainly, because the language around it is often deliberately vague. A lab-grown diamond is carbon arranged in the same cubic crystal lattice as a mined diamond. It has the same hardness – 10 on the Mohs scale – the same refractive index, the same dispersion and the same thermal conductivity. A standard diamond tester reads it as diamond because it is diamond.
What it is not is a simulant. Cubic zirconia and moissanite are different materials that resemble diamond; they are softer, they disperse light differently, and a jeweler can tell them apart quickly. Lab-grown diamond is not in that category, and it should never be sold as though it were.
How each one is made
Natural diamonds formed deep in the earth’s mantle under heat and pressure, then travelled toward the surface in volcanic rock. The timescales are enormous and the conditions were not uniform, which is why every natural stone carries a slightly different internal record of how it grew.
Lab-grown diamonds are made by one of two processes. High pressure, high temperature (HPHT) reproduces mantle conditions mechanically. Chemical vapor deposition (CVD) works differently: a thin diamond seed sits in a sealed chamber, a carbon-rich gas is energized into a plasma, and carbon atoms settle onto the seed layer by layer until a rough crystal has formed. It is then cut and polished exactly as mined rough would be. The stones in the lab-grown collection are produced by the CVD process.
They are graded on the same scales
Cut, color, clarity and carat weight mean exactly the same thing for both, and are assessed by the same laboratories against the same criteria. A G color lab-grown stone and a G color mined stone have been judged against the identical reference set. If you already understand the 4Cs, you already know how to read a lab-grown report.
Reports for lab-grown stones state clearly that the diamond is laboratory-grown, and reputable stones carry a laser inscription on the girdle recording it. Telling the two apart without that paperwork requires specialist equipment that reads growth patterns and trace elements. It is not something that can be done by eye, by loupe, or by a standard tester.
Where they genuinely differ: price
Lab-grown diamonds sell for substantially less per carat than mined stones of comparable grade. That gap is the entire practical argument for them. At a fixed budget you can generally choose a larger stone, a higher clarity or color grade, or both, and the difference is not subtle.
The reason is supply. Mined production is constrained by geology and by what is economic to extract. Lab-grown production is constrained by manufacturing capacity, which has expanded steadily, and prices have fallen as it has.
Where they genuinely differ: resale
This is the honest caveat, and it deserves more attention than it usually gets. Lab-grown diamonds do not hold secondhand value the way mined stones historically have, and because wholesale lab-grown prices have been falling, a stone bought today may be replaceable more cheaply in a few years.
If the ring is being bought to be worn, this matters very little. Most jewelry is a poor financial instrument regardless of what is set in it, and resale on mined diamonds bought at retail is also usually disappointing. If the stone is genuinely being bought as a store of value, a natural diamond is the more defensible choice, and you should expect to pay for that.
Origin and environmental claims
Both sides of this market make environmental and ethical arguments, and both are more complicated than the marketing suggests. Growing diamonds is energy-intensive, and how clean that energy is varies by producer. Mining has significant land and water impacts, but also supports employment in producing countries. Anyone offering a simple answer is selling something.
What you can reasonably ask for is documentation: which laboratory graded the stone and what the report says. Where a piece in this collection carries an independent grading report, the laboratory and the grades are stated in that product’s description.
So which should you buy?
Choose lab-grown if you want the most stone for your budget, if size or clarity matters more to you than provenance, and if you are comfortable that the piece is for wearing rather than holding. Most people buying an engagement ring today fall into this group.
Choose natural if the fact that the stone formed in the earth matters to you, if you want the better prospect of retained value, or if the piece is intended to be handed on. Neither answer is more sophisticated than the other. They are answers to different questions.
To see the difference in practice, compare the lab-grown collection against the natural diamond pieces at similar budgets, or start from engagement rings if you already know the setting you want.
Read next
How to Choose a Diamond: A Buyer’s Guide to the 4Cs – what cut, color, clarity and carat actually measure.
How to Choose an Engagement Ring – settings, metals and the order to decide things in.
14K vs 18K Gold – which karat suits a ring worn every day.
