Are Lab-Grown Diamonds Real Diamonds?

It is one of the most common questions in jewelry today, and the answer is clearer than the marketing sometimes makes it sound: yes, lab-grown diamonds are real diamonds. A lab-grown diamond is not a fake, a copy, or a "diamond alternative." It is a diamond — the same material as a mined stone, chemically and optically identical, just born in a laboratory instead of the earth. Understanding why, and how it differs from a true look-alike, makes you a far more confident shopper.

Diamond is April's birthstone — see the full stone in our April birthstone guide, and browse loose lab-grown diamonds and lab-grown diamond engagement rings as you read.

Are Lab-Grown Diamonds Real? The Science

Identical in every property that defines a diamond.

A lab-grown diamond is a genuine diamond. The Gemological Institute of America confirms that a laboratory-grown diamond has essentially the same chemical, physical, and optical properties as a mined one. Both are pure carbon crystallized in the same cubic structure; both rate a 10 on the Mohs hardness scale; and both display the same brilliance and fire. Place a natural and a lab-grown diamond side by side and even a trained eye cannot tell them apart without specialized equipment.

Same chemistry

A diamond is defined by its material — pure carbon atoms locked in a rigid, repeating lattice. A lab-grown diamond has exactly that structure. It is not "diamond-like." It is diamond, atom for atom.

Same hardness

Both mined and lab-grown diamonds sit at the very top of the Mohs scale, a perfect 10 — the hardest natural material known. That is why a diamond, from either origin, resists scratching better than any other gem and is ideal for a ring worn every single day.

Same sparkle

Brilliance (white light return) and fire (the rainbow flashes) come from the way a diamond bends light — a property fixed by its chemistry, not its birthplace. A well-cut lab-grown diamond sparkles exactly like a well-cut mined one, because the physics is the same.

Lab-Grown Diamond vs Simulant

The distinction that trips everyone up.

Here is the single most important thing to understand, because it is where the confusion happens. There is a world of difference between a lab-grown diamond and a diamond simulant:

• A lab-grown diamond IS a diamond. Same carbon, same crystal, same properties — just grown in a lab.
• A simulant only LOOKS like a diamond. Cubic zirconia and moissanite are clear and sparkly, but they are entirely different materials — not carbon diamonds at all. They are imitations, not diamonds.

So when someone asks "is it real?", the honest answer for a lab-grown diamond is an unqualified yes, while a simulant is a genuine gem of its own but not a diamond. Moissanite, for example, is a beautiful and durable stone — but it is silicon carbide, not diamond. We cover the details in our guides on whether moissanite is a lab-grown diamond and moissanite vs cubic zirconia.

Do lab-grown diamonds pass a diamond tester?

Yes. Because a lab-grown diamond is chemically diamond, it has diamond's thermal conductivity and reads as "diamond" on a standard tester, just like a mined stone. Simulants can behave differently — moissanite, in particular, can fool a basic thermal tester, which is why dual testers exist. Our guide on whether moissanite passes a diamond tester explains exactly how the testing works.

Lab-Grown vs Natural: What Actually Differs

Same material — only origin and price change.

If lab-grown and natural diamonds are the same material, what separates them? Really just two things: origin and price. A natural diamond formed one to three billion years ago deep in the earth; a lab-grown diamond was created recently under controlled conditions. That difference in rarity is why natural diamonds cost more and hold value better, while lab-grown diamonds are far more affordable. Here is the honest, side-by-side comparison:

The physical clues that let experts tell them apart are subtle: most natural diamonds contain tiny amounts of nitrogen (lab-grown typically do not), lab stones may show distinctive growth patterns or trace metallic inclusions from the growth process, and lab diamonds are usually laser-inscribed on the girdle. None of this is visible to the naked eye — it takes gemological equipment. For a deeper look at the trade-offs, see our lab-grown vs natural diamond guide.

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Lab-Grown Diamond Rings

IGI-certified lab-grown diamonds set to order in sterling silver, vermeil, or solid gold.

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The FTC Ruling: Officially "Real"

Why "real" and "natural" are not the same thing.

This is not just a marketing claim — it is official. In 2018, the U.S. Federal Trade Commission revised its Jewelry Guides (16 CFR Part 23) and removed the word "natural" from the definition of a diamond. The updated definition reads, in essence, that "a diamond is a mineral consisting essentially of pure carbon crystallized in the isometric system" — with no requirement that it be mined. In other words, the government formally recognized that a lab-grown stone with the same properties as a mined one is a diamond.

The FTC does draw one clear line: sellers must disclose that a lab-grown diamond is not mined, using a qualifier such as "laboratory-grown," "laboratory-created," or "[maker]-created." Calling it simply a "diamond" with no qualifier is considered deceptive. The takeaway for shoppers: "real" and "natural" are not the same thing — a lab-grown diamond is 100% real, it is just not mined.

How Lab-Grown Diamonds Are Made

Two ways to grow a real diamond.

Both methods start with a tiny diamond "seed" and end with a real diamond crystal — in days to weeks rather than billions of years.

HPHT — High Pressure, High Temperature

HPHT recreates the deep-earth conditions that form natural diamonds, subjecting carbon to immense pressure and heat with a molten-metal catalyst until it crystallizes onto the seed. It is the original method, dating to the 1950s, and is also used to refine the color of some finished stones.

CVD — Chemical Vapor Deposition

CVD is the newer approach: a carbon-rich gas such as methane is energized into a plasma inside a vacuum chamber, and carbon atoms rain down to build the diamond up layer by layer. CVD stones sometimes get a follow-up HPHT treatment to refine their color.

Either way, the rough diamond is then cut, polished, and graded exactly like a mined one. The method — HPHT or CVD — is simply noted on the grading report.

Grading, Certification & Disclosure

The same rigor as natural diamonds.

Lab-grown diamonds are graded by the same respected laboratories — GIA and IGI chief among them — using the same 4Cs that define natural diamond quality. The GIA's 4Cs are:

• Cut — how well the stone is proportioned and polished; the biggest driver of sparkle.
• Color — graded from colorless (D) down the scale; less color is rarer and brighter.
• Clarity — how few internal inclusions and surface blemishes the stone has.
• Carat — the weight, and therefore the visual size, of the diamond.

The grading report clearly states the stone is laboratory-grown, and most lab diamonds carry a microscopic laser inscription reading "lab grown" on the girdle, tied to their certificate. When buying, look for a reputable certificate and clear disclosure — that is your guarantee of exactly what you are getting.

Price, Value & Resale

What the choice really comes down to.

The headline advantage of lab-grown diamonds is price: they typically cost a fraction of a comparable natural diamond, so the same budget buys a larger or higher-quality stone. As production has scaled, prices have continued to fall, widening the gap further.

The trade-off is resale value. Because lab-grown diamonds are not rare and their prices keep dropping, they do not hold value the way natural stones can — so they are best bought for enjoyment and meaning rather than as an investment. On ethics, lab-grown diamonds sidestep mining entirely, removing conflict-diamond risk and land disturbance, and they are fully traceable; the nuance is that growing them is energy-intensive, so the energy source matters, and responsible mining also supports many communities. Both can be responsibly sourced. If budget is your starting point, our guide on how much to spend on an engagement ring puts real numbers to it.

How to Choose: Lab-Grown or Natural

Match the stone to what you value.

Either way, you are getting a real diamond. The decision comes down to what matters most to you:

• Choose lab-grown if you want a real diamond for far less, a bigger or higher-quality stone for your budget, guaranteed traceability, and a purchase for beauty rather than resale.
• Choose natural if rarity and a billion-year origin move you, if stronger long-term resale matters, or if you love the tradition and story of a mined stone.

Once you have picked your stone, the setting is next. Compare the looks in our engagement ring styles and setting types guide, then explore by shape and design — a solitaire to let the diamond speak, a halo or hidden halo for extra sparkle, or a three-stone design. Prefer a mined-free look-alike instead? Browse moissanite engagement rings or read moissanite vs lab-grown diamond.

Lab-Grown Diamond FAQ