Are lab-grown diamonds real diamonds?
Yes. A lab-grown diamond is chemically, physically and optically identical to a mined one — the same pure crystallised carbon, the same 10 on the hardness scale, graded on the same 4Cs by the same laboratories. The only meaningful differences are how it formed and what it costs: typically 60–80% less than a natural diamond of the same specification.
This is the question people are most nervous to ask, so here is the direct answer: a lab-grown diamond is not a simulant, an imitation, or a substitute. It is a diamond. Cubic zirconia and moissanite are different materials that look diamond-ish; a lab-grown diamond IS diamond, and no jeweller can tell it from a mined stone by eye or with a loupe.
The difference is time and place. A natural diamond crystallised deep in the earth over one to three billion years. A lab-grown diamond crystallises in a chamber that recreates the same heat and pressure — or grows atom by atom from carbon gas — over six to ten weeks. Same carbon, same lattice, same fire.
What that changes is what your budget buys. At the same price, a lab-grown stone is typically two to four times the carat weight, with a higher colour and clarity grade. What it does not buy is resale value: the lab-grown market has little secondary demand, so buy one to wear and enjoy, not as an investment. Natural diamonds hold value better, though retail resale is poor for both.
Side by side
Nine things people want to know, answered for both.
| Lab-grown | Natural | |
|---|---|---|
| What it is | Real diamond — pure crystallised carbon. | Real diamond — pure crystallised carbon. |
| How it formed | In a chamber that recreates the earth's heat and pressure, over 6–10 weeks. | Under the earth's crust, over 1–3 billion years. |
| Can you tell them apart? | No — not by eye, not with a loupe. Only specialist lab equipment can. | No — identical hardness, sparkle and chemistry. |
| Hardness | 10 on the Mohs scale — the hardest material there is. | 10 on the Mohs scale — identical. |
| Price for the same stone | Roughly 60–80% less. | The premium is for rarity, not for quality. |
| What your budget buys | A visibly larger, cleaner, whiter stone. | A smaller stone at the same spend. |
| Certification | Graded on the same 4Cs by the same labs (IGI, GIA). | Graded on the same 4Cs. |
| Resale | Little resale market — buy it to wear, not as an investment. | Holds value better, though retail resale is still poor. |
| Origin | Fully traceable, conflict-free by definition. | Traceable through certification schemes, with more supply-chain steps. |
What the same money buys
The practical consequence, at a typical retail spread. A lab-grown stone at the same price is usually two to four times the weight.
Roughly what one budget buys either way, at the same colour and clarity. Drawn to scale.
Millimetres are the face-up width of one diamond, cut to standard round-brilliant proportions. A deeper cut of the same weight looks a little smaller from above; a shallower one, a little larger.
What lab-grown is NOT
Three things that get confused with it, and are not the same at all.
Cubic zirconia
A different material entirely — zirconium dioxide. Softer, heavier, and it clouds with wear. Not a diamond.
Moissanite
Silicon carbide. Genuinely beautiful and very hard, but a different stone with more rainbow flash than a diamond. Privosa does not sell it.
Diamond simulant
Any stone made to look like a diamond without being one. A lab-grown diamond is not a simulant — it is diamond.
Our position, stated plainly
Privosa stocks lab-grown diamonds because they let a real diamond be an ordinary purchase rather than a once-in-a-lifetime one. We will not tell you natural diamonds are a con — they are not. We will tell you that nobody looking at your hand can tell the difference.
Common questions
Are lab-grown diamonds real diamonds?
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Yes. They are pure crystallised carbon with the identical atomic structure, hardness, refractive index and sparkle as mined diamonds. Both the US Federal Trade Commission and the world's gemological laboratories classify them as diamonds.
Can a jeweller tell a lab-grown diamond from a natural one?
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Not by eye, and not with a standard 10× loupe. Distinguishing them requires specialist laboratory instruments that detect the minute growth patterns and trace elements left by each formation process.
How much cheaper are lab-grown diamonds?
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Typically 60–80% less than a natural diamond of the same carat, colour, clarity and cut. In practice that means the same budget buys a substantially larger and cleaner stone.
Do lab-grown diamonds hold their value?
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No, not well. There is very little secondary market for them, and prices have fallen as production has scaled. They should be bought to be worn rather than as a store of value. Natural diamonds retain value better, though the retail resale market is weak for both.
Do lab-grown diamonds get cloudy or lose their sparkle?
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No. This is a persistent myth. A diamond is a diamond — it rates 10 on the Mohs hardness scale and does not degrade, cloud or dull over time. Like any jewelry it needs periodic cleaning to remove skin oils and soap film.
Are lab-grown diamonds certified?
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Yes. IGI and GIA grade lab-grown diamonds on the same 4Cs as natural ones, and the report states that the stone is laboratory-grown. Privosa's IGI-certified pieces are flagged as such on their product pages.
Which is more ethical, lab-grown or natural?
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Lab-grown diamonds are conflict-free by definition and fully traceable, with no mining footprint — though growing them is energy-intensive. Natural diamonds today are largely governed by certification schemes and support significant local economies. Both arguments are reasonable; neither is unambiguous.
Last reviewed August 2026