Quick answer: Yes. A lab-grown diamond is a real diamond — pure crystallized carbon with the same crystal structure as one formed in the earth. It has essentially the same physical, chemical and optical properties as a mined diamond; the only difference is where it grew. It is graded against the same 4Cs standards by independent laboratories, and it scores a perfect 10 on the Mohs hardness scale.
What is a lab-grown diamond?
A lab-grown diamond is a real diamond: pure crystallized carbon, with the same crystal structure as a diamond formed in the earth — not glass, not crystal, not an imitation. The only difference is where it grew: in a matter of weeks inside a laboratory that recreates the exact conditions found deep in the earth, rather than over billions of years underground.
This is the single most important thing to understand before you buy. A lab-grown diamond is not a "fake" or a stand-in for the real thing. It is the real thing — grown, not mined.
What is a diamond actually made of?
A diamond — mined or lab-grown — is pure carbon, with every atom bonded to four neighbors in a rigid three-dimensional lattice. Those covalent bonds are among the strongest in nature, and the geometry leaves no weak direction to push against — which is why diamond is the hardest known material and sits alone at 10 on the Mohs scale. Graphite in a pencil is the same carbon with a different structure; the arrangement, not the ingredient, is what makes a diamond a diamond. A lab simply recreates the conditions that force carbon into that arrangement.
Here's a detail that surprises people: many lab-grown diamonds qualify as Type IIa — the most chemically pure category of diamond, with virtually no nitrogen in the lattice. In nature, Type IIa is rare and prized (many of the world's legendary diamonds belong to it); in the lab, that purity is a routine outcome of a controlled process.
Is a lab-grown diamond the same as a natural (mined) diamond?
A lab-grown diamond has essentially the same physical, chemical and optical properties as a mined one — the same carbon crystal, the same hardness, the same brightness, fire and sparkle. A gemologist cannot tell the two apart just by looking; they are judged against the same 4Cs standards by independent laboratories. The only differences are microscopic traces of how the crystal grew, readable solely by a lab.
What changes is origin, and everything origin brings with it: no mining, a lighter footprint, and a price that lets you choose a larger, finer stone for the same budget. You are not trading down. You are trading the mine for the lab.
Lab-grown diamond vs. moissanite vs. cubic zirconia — what's the difference?
A lab-grown diamond is a diamond. Moissanite and cubic zirconia only imitate one — they are simulants, made of entirely different materials.
| Stone | What it actually is | Hardness (Mohs) | Diamond or simulant? |
|---|---|---|---|
| Lab-grown diamond | Crystallized carbon — a real diamond | 10 | Diamond |
| Moissanite | Silicon carbide; throws more rainbow "fire" | 9.25 | Simulant |
| Cubic zirconia (CZ) | Zirconium dioxide; soft, clouds and scratches over time | ~8 | Simulant |
The short version: a lab-grown diamond is a diamond; moissanite and CZ look like one but aren't. Everything DelaFuente sets is a genuine diamond, mined or lab-grown — never a simulant.
How are lab-grown diamonds made? HPHT vs. CVD
There are two ways to grow a diamond, and both begin with a tiny diamond "seed."
- HPHT (High Pressure, High Temperature) recreates the heat and crushing pressure of the earth's mantle, dissolving carbon and crystallizing it onto the seed.
- CVD (Chemical Vapor Deposition) places the seed in a chamber filled with a carbon-rich gas, energized so carbon atoms settle onto the seed layer by layer, like frost forming on glass.
Different paths, identical result: a real diamond. Which method was used doesn't change the beauty or quality of the finished stone — that comes down to the 4Cs.
Can a lab-grown diamond be told apart from a natural one?
Not with the naked eye, and not with a standard jeweler's loupe — to the eye they are the same stone. Distinguishing a lab-grown diamond from a mined one requires specialized laboratory equipment that detects microscopic traces of how the crystal grew, the kind of gear only a grading lab has.
What the lab actually reads is the crystal's biography: growth patterns (a mined diamond grew in slow octahedral layers; HPHT and CVD stones grow in their own distinctive geometries) and photoluminescence — how the stone's trace atoms glow under specific wavelengths, a fingerprint of the environment it grew in. None of it is visible in the finished stone's beauty; all of it is legible to a spectrometer.
Does a lab-grown diamond pass a diamond tester?
Yes. A standard handheld diamond tester reads thermal (or electrical) conductivity — and since a lab-grown diamond is diamond, it conducts exactly like one and tests as diamond every time. That's the neat proof of the whole story: the tester can't tell them apart because, at the level the tester measures, there's nothing to tell apart. (Simulants fail: cubic zirconia reads as non-diamond, and moissanite needs a special dual tester precisely because it isn't diamond.) The only "tester" that separates lab from mined is a grading lab's spectrometer.
Why are lab-grown diamonds so much cheaper?
Not because they're lesser — because the supply chain is shorter. A mined diamond's price carries exploration, mining thousands of tons of rock per carat, and a long chain of middlemen. A lab-grown diamond skips all of it: weeks of controlled growth, straight to the cutter. As the technology improves, production costs keep falling — which is why the gap keeps widening in your favor. Same stone, radically simpler path to your hand.
Are lab-grown diamonds flawless?
No — and this surprises people. Lab-grown diamonds grow with inclusions and colour variations just like mined ones, which is why they're graded on the exact same 4Cs scale by the same labs. A lab-grown diamond can be a D-flawless or a J-SI2. The lab controls the process, not every atom — you still choose your stone by its grades, not its origin.
How are lab-grown diamonds certified — and what did GIA just change?
Every serious lab-grown diamond still comes with an independent laboratory report — but which report changed recently, and it's worth understanding.
As of October 1, 2025, GIA no longer grades lab-grown diamonds on its famous 4Cs nomenclature (the D–Z colour scale, the FL–I clarity scale). Instead, GIA now issues a simplified Quality Assessment that sorts a lab-grown stone into just two tiers — "Premium" (roughly: D colour, VVS+ clarity, excellent finish) or "Standard" — or no designation at all if it misses the minimum. GIA's stated reason: more than 95% of lab-grown diamonds now fall into a very narrow, very high range of colour and clarity, so it reserves its full granular scale for mined stones.
What this means for you as a buyer, honestly:
- It says nothing bad about the stones. The narrow-range argument is actually a compliment to how good lab-grown production has become.
- IGI still grades lab-grown diamonds on the full 4Cs — exact colour grade, exact clarity grade, cut, the works — which is why IGI was already the dominant lab for lab-grown and is now effectively the standard for detailed lab-grown grading.
- Practical takeaway: if you want to choose your lab-grown stone by its precise grades (and you should — that's how you buy well), the full report to look for is IGI's. Every lab-grown diamond DelaFuente sells carries one, laser-inscribed and verifiable online.
Do lab-grown diamonds get cloudy or fade over time?
No. A lab-grown diamond is the same carbon crystal as a mined one, and there is nothing in it to degrade, yellow, cloud or fade — not in a decade, not in a lifetime. (This is exactly where diamond simulants differ: cubic zirconia genuinely does cloud and scratch with wear.) If a diamond ever looks dull, it's surface grime from lotions and skin oils — a thirty-second clean restores it completely.
Are lab-grown diamonds tacky?
No — and the market has already voted. Most engagement-ring buyers of this generation now choose lab-grown, and the stigma some feared simply hasn't materialized: to the eye (including a trained one), it's the same stone, and what people actually notice is the beauty of the diamond, not its birthplace. The honest way to think about it: "tacky" describes things that pretend to be what they're not. A lab-grown diamond pretends nothing — it's a certified, real diamond with its origin printed on the report. Wearing a bigger, finer stone you chose deliberately, for reasons you can explain, is the opposite of tacky.
Do lab-grown diamonds hold their value?
Here's the honest version. Because a lab-grown diamond costs less to produce, you get noticeably more diamond for your money — a larger, cleaner, whiter stone for the same budget than mined would allow.
The trade-off: lab-grown diamonds have a lower resale value than mined ones — typically a small fraction of the purchase price — and the reason is structural: production keeps getting better and cheaper, so the market price of new lab-grown diamonds keeps drifting down, taking resale values with it. (Mined diamonds resell poorly too, once retail markups are stripped out; lab-grown simply resells worse.)
So here's the honest frame: diamonds in general are not an investment. Buy the ring for what it means and how it looks on the hand — not as a financial asset. If that's your lens, lab-grown gives you the most beautiful stone for the money, full stop.
How durable is a lab-grown diamond?
A lab-grown diamond scores a perfect 10 on the Mohs scale of hardness — exactly like a mined diamond, and the highest score any material can reach. It is just as resistant to scratching and just as suited to daily wear as a mined stone, which is precisely why diamond is the stone for a ring you'll wear every day for the rest of your life.
