Lab grown diamonds are real diamonds — in the scientific sense, the legal sense, and every practical sense that matters when you're wearing one.
That's the direct answer. But it's a short answer to a question that deserves a thorough one, because while the science is settled, there is genuine nuance around grading, pricing, and what "real" means for different buyers. This guide covers all of it.
What Makes Any Diamond "Real"?
Before answering whether lab grown diamonds are real, it helps to be precise about what a diamond actually is — because the definition is stricter and simpler than most people realize.
A diamond is defined entirely by its chemistry and structure:
- Chemical composition: Pure carbon (C), with atoms bonded in a face-centered cubic crystal lattice
- Hardness: 10 on the Mohs scale — the maximum, and the hardest naturally occurring material known
- Refractive index: 2.417–2.419, which produces the characteristic brilliance and fire
- Density: 3.51–3.53 g/cm³
- Thermal conductivity: Extremely high — among any material on Earth, which is why diamonds feel cold
Lab grown diamonds satisfy every single one of these criteria — fully, and without qualification.
The confusion arises because people often conflate "diamond" with "naturally formed diamond" — as if origin were part of the mineral's definition. It isn't. Water is water whether it comes from a mountain spring or a filtration system. The molecule doesn't change based on where it formed.
The Science Is Settled
This isn't a close debate in gemological circles. When scientists test a lab grown diamond and a mined diamond side by side, here's what they find:
Visually: Identical. Neither the naked eye nor a jeweler's loupe can distinguish them.
On a diamond tester: Identical. Standard testers check for diamond's characteristic thermal conductivity — lab grown diamonds pass every time, because they have the same thermal conductivity as mined stones.
Under a spectroscope: Identical. The absorption spectrum of a lab grown diamond matches that of a natural diamond precisely.
Chemical analysis: Identical. Pure carbon, cubic lattice, same density, same hardness.
The only instruments that can detect a difference are advanced gemological devices — like GIA's DiamondView — that analyze microscopic growth patterns and nitrogen distribution. These can identify how a diamond was formed (in the Earth vs. in a lab vs. HPHT vs. CVD), but they're looking at origin signatures, not quality differences. The diamond itself hasn't changed.
This is also the scientific community's consensus. Across gemological research, the finding is consistent: lab grown and natural diamonds are the same material, formed through equivalent processes, with indistinguishable end properties.
What U.S. Law Says
In 2018, the Federal Trade Commission updated its Jewelry Guides — the federal guidelines governing how jewelry products must be described in marketing and advertising. The most significant change: the FTC removed the word "natural" from its definition of a diamond.
The revised definition now reads: a diamond is a mineral consisting essentially of pure carbon crystallized in the isometric system.
No mention of origin. No mention of mining. No mention of the Earth. If a stone meets the chemical and structural criteria, it meets the definition.
It's worth being precise about what the ruling does and doesn't say, because this is sometimes overstated in both directions. The FTC did not declare that lab grown diamonds can be marketed simply as "diamonds" without qualification — sellers are still required to clearly disclose that a stone is laboratory-grown, using terms like "laboratory-grown," "laboratory-created," or "man-made." That transparency requirement remains firmly in place.
What the ruling does establish is that lab grown diamonds cannot be legitimately described as fake, inferior, or not real diamonds — because under the FTC's own definition, they satisfy every criterion. At the same time, the FTC also notes that lab grown sellers cannot use unqualified terms like "real," "genuine," or "natural" to describe their own stones without appropriate disclosure. The guides require honesty from all sides.
The GIA has certified lab grown diamonds since 2006, applying the Four Cs grading framework to both lab grown and mined stones — though as we cover in the grading section below, GIA updated its approach to lab grown color and clarity grades in 2025. A third lab worth knowing is GCAL (Gem Certification & Assurance Lab), which has gained traction particularly since GIA's 2025 change — GCAL continues to apply full 4Cs grading alongside an optional performance assessment that evaluates light behavior beyond the standard criteria. For a full explanation of how cut, color, clarity, and carat weight affect what you actually see in a diamond, see our Diamond Education: The 4Cs guide.
Lab Grown vs. Diamond Simulants: A Critical Distinction
One of the most persistent misconceptions is that lab grown diamonds belong in the same category as cubic zirconia or moissanite. The distinction is more fundamental than most people realize:
| Stone | Material | Mohs Hardness | Passes Diamond Tester? | Same as Diamond? |
|---|---|---|---|---|
| Lab Grown Diamond | Pure carbon | 10 | ✅ Yes | ✅ Yes |
| Natural Diamond | Pure carbon | 10 | ✅ Yes | — |
| Moissanite | Silicon carbide | 9.25 | ⚠️ Sometimes* | ❌ No |
| Cubic Zirconia (CZ) | Zirconium dioxide | 8–8.5 | ❌ No | ❌ No |
| White Sapphire | Aluminum oxide | 9 | ❌ No | ❌ No |
Note: Basic thermal testers may give a false positive for moissanite due to its high thermal conductivity. Advanced testers that also check electrical conductivity will distinguish it correctly.
Lab grown diamonds and natural diamonds are the same material. Everything else on that list is a different material that merely resembles a diamond visually. The distinction is chemical and fundamental — not a matter of degree.
Lab Grown Diamonds Are Often Purer — Here's Why
About 98% of naturally mined diamonds contain nitrogen clusters trapped during formation underground — what gemologists classify as Type Ia — which causes the slight warmth or tinting in lower color grades (Gemological Institute of America). CVD lab grown diamonds form in a nitrogen-controlled environment, routinely producing Type IIa stones: the chemically purest classification, with essentially no nitrogen. Only about 1–2% of natural diamonds ever reach Type IIa; CVD production achieves it as the norm. The practical result is that CVD diamonds achieve D, E, and F (colorless) grades more consistently than mined diamonds — not because of any special treatment, but because the growth environment excludes the impurities that cause warmth in the first place.
What About Inclusions?
Lab grown diamonds can have inclusions — just like mined diamonds, and some inclusion types are common to all three categories. Clouds, feathers, and certain crystal inclusions can appear in natural, CVD, and HPHT stones alike.
What differs is that each formation process also leaves its own distinctive traces. CVD diamonds may contain graphite inclusions or strain-related patterns from the gas deposition process. HPHT diamonds can carry tiny metallic particles — iron, nickel, or cobalt — from the flux catalyst used in growth. Natural diamonds typically include mineral crystals such as garnets or rutile needles, and occasionally microscopic fluid pockets from their deep-earth formation.
None of these are visible to the naked eye at VS1 or VS2 clarity grades — which is what the certification says, and what a well-chosen stone will show you when you wear it.
GIA Grading Update (October 2025): What Buyers Should Know
Important update for buyers: In October 2025, GIA changed how it grades lab grown diamonds. If you're comparing certificates or shopping for a certified stone, here's what you need to know.
One development worth understanding: in October 2025, GIA updated how it grades lab grown diamonds. Rather than issuing individual letter grades for color and clarity (like "F color, VVS2 clarity"), GIA now uses two broader tiers on lab grown reports — "Premium" and "Standard."
GIA's stated reason: over 95% of lab grown diamonds cluster in a narrow high-quality range, making the full grading scale less meaningful for this category. The lab also expressed concern that the market was treating lab grown 4Cs grades as directly equivalent to natural diamond grades for pricing purposes.
The IGI (International Gemological Institute) took a different position. IGI announced in mid-2025 that it would continue applying full individual 4Cs grades (D/VS1, E/SI2, etc.) to lab grown diamonds, on the basis that the 4Cs system measures physical and optical quality — which applies equally to both stone types.
What this means practically:
- IGI-certified lab grown diamonds still carry individual color and clarity grades
- GIA-certified lab grown diamonds (from October 2025 onward) show "Premium" or "Standard" tiers instead of letter grades
- Carat weight and cut grade remain the same on both
- For comparison shopping and pricing purposes, IGI reports currently provide more actionable detail for lab grown stones
At LabGrownDiamonds.com, we work with certified stones and can walk you through exactly what your certificate means. Common certification questions are also answered in our FAQ.
So Are They "Worth It"?
This is really what most people are asking when they wonder if lab grown diamonds are real — they want to know if they're getting something genuine or something that will disappoint them.
The honest answer: for beauty, durability, and wearability, lab grown diamonds absolutely deliver. A certified lab grown diamond sparkles the same, holds up the same, and wears the same as its mined equivalent — because it is the same material. You can browse our stud earrings, engagement rings, and fine jewelry with that confidence.
The one area where lab grown and natural diamonds genuinely differ is resale value — and this is worth understanding clearly, because the conventional wisdom gets it somewhat wrong.
The standard line is that natural diamonds "hold their value" and lab grown ones don't. The truth is more nuanced: neither type of diamond is a good financial investment for most buyers. Natural diamonds do have a more active secondary market, but the actual resale experience tends to disappoint people who've been told their stone is a valuable asset.
Here's why that gap is so large: the price you paid at retail reflects decades of marketing investment, controlled supply, and a distribution chain with many hands between the mine and the jeweler's counter. What a dealer offers you back is what it's worth at wholesale, in a secondary market with none of those factors attached. A $70,000 natural diamond getting a $10,000 offer from a jeweler — an 85% loss — is not an unusual outcome. That disconnect isn't just retail-vs-wholesale; it's also a reflection of how artificially elevated original retail prices have historically been, propped up by tightly managed supply and extraordinary marketing spend over more than a century. The reckoning happens at resale.
Where lab grown diamonds change the equation isn't in resale performance — it's in purchase price. A comparable stone might cost $4,000 instead of $70,000. In a worst-case resale scenario, the financial exposure is a fraction of what it would be with a mined stone.
Buy a diamond to wear it, to celebrate something, to mark a moment — not as a financial strategy. And if that's your intention, lab grown diamonds offer something that genuinely wasn't accessible before: a stunning, certified, real diamond at a price that reflects the stone itself — not the century of mythology built around it.
That's not a compromise. That's just a better deal.
Frequently Asked Questions
Are lab grown diamonds real diamonds or fake? Lab grown diamonds are real diamonds — not fakes, not imitations, and not the same as cubic zirconia or moissanite. They are chemically and physically identical to mined diamonds. The U.S. Federal Trade Commission confirmed this in 2018 by removing the word "natural" from the legal definition of a diamond.
Can jewelers tell if a diamond is lab grown? Not with standard tools. A jeweler using a loupe or a conventional diamond tester cannot distinguish a lab grown diamond from a mined one. The only instruments that can are specialized gemological detection devices — and they work in a specific way worth understanding. Rather than looking for something "wrong" with lab grown diamonds, they look for something present in natural ones: the distinctive pattern of lattice defects that accumulates over billions of years of geological formation. The GIA iD100, for example, uses fluorescence spectroscopy to detect trace amounts of these natural defect signatures. A natural diamond returns a "Pass"; any stone that doesn't display that natural defect fingerprint — including lab grown diamonds — returns a "Refer" for further testing. Similar technology powers devices like the Yehuda Sherlock Holmes detector and the JTR Reveal 2S. These are professional tools, not standard equipment at most jewelry counters — meaning the average retail jeweler looking at your ring cannot make this determination on the spot.
Do lab grown diamonds test as real diamonds? Yes. Standard diamond testers measure thermal conductivity, which is identical in lab grown and natural diamonds. A lab grown diamond passes every standard diamond test.
Are lab grown diamonds worth buying? For the vast majority of buyers purchasing diamonds to wear and enjoy, yes. The stone is physically identical to a mined diamond, certified by the same labs, and costs significantly less. The main trade-off is resale value — neither type is a great financial investment, but natural diamonds have a more active secondary market. If you're buying a diamond to wear rather than to resell, lab grown offers the same diamond for a fraction of the cost.
What is the difference between lab grown and synthetic diamonds? They're the same thing. "Synthetic" is a technical gemological term that simply means "not formed in the Earth" — it doesn't mean fake or inferior. The FTC actually removed "synthetic" from its recommended descriptors in 2018 because of its misleading connotations. "Lab grown," "laboratory-created," and "man-made" are the preferred terms.
Continue your research: What Is a Lab Grown Diamond? | How Are Lab Grown Diamonds Made? | Lab Grown vs. Natural Diamond
