Are Lab-Grown Diamonds Real Diamonds? (FTC, GIA & Science Explained)

Last Updated: June 19, 2026 | Reading Time: 13 minutes

Are Lab-Grown Diamonds Real Diamonds? (FTC, GIA & Science Explained)

Yes, lab-grown diamonds are 100% real diamonds - chemically, physically, and optically identical to mined diamonds - and this is the official position of the FTC (since 2018), the GIA (which grades them on the same scale), and every gemological authority worldwide. The only meaningful differences are origin (months in a lab vs billions of years in the earth) and price (60–85% cheaper for identical specs), which is why lab-grown now accounts for ~52% of all engagement ring center stones sold in the US.

The FTC 2018 Ruling: Lab-Grown Are Diamonds

In July 2018, the U.S. Federal Trade Commission (FTC) issued a landmark revision to its Jewelry Guides that formally settled the question of whether lab-grown diamonds qualify as real diamonds. The FTC removed the word "natural" from the definition of a diamond. The previous definition (1956) described a diamond as "a natural mineral consisting essentially of pure carbon crystallized in the isometric system." The 2018 revision dropped "natural," defining a diamond simply as a mineral consisting essentially of pure carbon crystallized in the isometric (cubic) system.

This change was significant because it formally acknowledged what gemologists had known for decades: lab-grown diamonds meet every scientific criterion to be classified as diamonds. The FTC ruling means that retailers can legally market lab-grown stones as "diamonds" (with required disclosure of origin), and that calling them "synthetic," "fake," or "simulated" without qualification is misleading.

Key FTC takeaways from the 2018 Jewelry Guides:

• Lab-grown diamonds are diamonds, not simulants
• The term "synthetic" can be used but is no longer required, because it has been shown to mislead consumers into believing the product is "fake"
• Required disclosure terms: "laboratory-grown," "laboratory-created," "[manufacturer name]-created," or another clear qualifier of non-mined origin
• Cubic zirconia, moissanite, and other simulants are NOT diamonds and cannot be sold under the diamond name
• The FTC distinguished between "synthetic diamonds" (real diamonds grown in a lab) and "diamond simulants" (different materials that look like diamond)

The Science: CVD, HPHT, and Atomic Structure

A diamond is, by definition, pure carbon (C) arranged in a specific crystal lattice known as the diamond cubic structure. Every carbon atom is covalently bonded to four neighboring carbon atoms in a tetrahedral arrangement, producing the hardest natural material known. This is true whether the carbon atoms organized themselves under the earth's mantle over billions of years or inside a reactor over a few weeks. The atomic structure is the same; therefore, the material is the same.

How CVD (Chemical Vapor Deposition) Diamonds Are Grown

• A thin "seed" of diamond is placed inside a vacuum chamber
• Methane (CH₄) and hydrogen gas are introduced and heated to ~800–1,200°C with microwave plasma
• Carbon atoms separate from the methane and deposit on the seed, growing the crystal layer by layer
• Growth takes 2–4 weeks for a 1ct rough crystal
• CVD diamonds are then cut and polished using the same equipment used for mined diamonds

How HPHT (High Pressure High Temperature) Diamonds Are Grown

• A diamond seed is placed in a press with a carbon source (typically graphite) and a metal catalyst (iron, nickel, cobalt)
• Conditions mimic the earth's mantle: ~5–6 GPa of pressure and ~1,300–1,600°C
• Carbon dissolves in the molten metal, migrates to the seed, and crystallizes
• Growth takes a few days to two weeks for gem-quality crystals
• HPHT is the older method (developed by GE in 1954); CVD has overtaken it for gem-quality production

Both processes produce real, gem-quality diamonds - the same crystal, the same hardness, the same brilliance, the same fire. The earth uses extreme pressure and temperature in the mantle; the lab uses controlled pressure/temperature or vapor deposition. The end product is chemically and crystallographically identical.

GIA Grading: Same 4Cs, Separate Report

The Gemological Institute of America (GIA) - the world's most respected diamond grading authority - has graded lab-grown diamonds since 2007 and uses the exact same 4Cs scale (Cut, Color, Clarity, Carat) that it uses for natural diamonds. A D-color VS1 lab-grown diamond has the same color and clarity as a D-color VS1 natural diamond.

What's on a GIA Lab-Grown Diamond Report

• Document title: "Laboratory-Grown Diamond Report" (clearly distinguished from the natural "Diamond Grading Report")
• Color grade: D–Z scale (same as natural)
• Clarity grade: FL–I3 scale (same as natural)
• Cut grade: Excellent–Poor (same as natural, for rounds)
• Carat weight: measured to 0.01ct (same as natural)
• Origin: "Laboratory-Grown" with growth method (HPHT or CVD)
• Post-growth treatments: disclosed if present (e.g., HPHT annealing to improve color)
• Laser inscription: the girdle is laser-inscribed with the GIA report number and the words "Laboratory-Grown" - visible only under magnification

IGI (International Gemological Institute) is even more dominant in the lab-grown segment, grading roughly 70% of certified lab-grown diamonds sold globally. For more on certifying labs, see our GIA vs IGI vs AGS certification guide.

Lab-Grown vs Mined: Property-by-Property

Every measurable physical, chemical, and optical property is identical. This is not a marketing claim - it is the consensus of gemological science, repeatedly verified by GIA, IGI, AGS, and academic mineralogy departments worldwide.

The only meaningful scientific difference is the pattern of trace impurities (the small amounts of nitrogen, boron, or hydrogen incorporated during growth) and the internal growth structure. Natural diamonds grew slowly under variable mantle conditions and show "strain patterns" consistent with octahedral growth; CVD diamonds show layered growth banding; HPHT diamonds often show cuboctahedral growth sectors. These patterns are invisible to the human eye and require specialized lab equipment to detect.

How to Tell Them Apart (Spoiler: You Can't)

Here is the truth that the natural-diamond marketing industry would prefer you didn't know: no jeweler can tell a lab-grown diamond from a natural diamond using a standard 10x loupe. This is not an opinion - it is a published scientific fact, repeatedly confirmed by GIA. Distinguishing lab-grown from natural requires specialized laboratory equipment that most retail jewelers do not own.

What Doesn't Work for Identification

• 10x loupe: can identify inclusions but not origin
• Standard microscope: growth patterns are too subtle for most magnifications
• Diamond tester (thermal/electrical): both lab-grown and natural test positive - they ARE diamonds
• Fog test, scratch test, water test: all useless - both behave identically
• UV light (basic): not reliable; both can fluoresce

What Actually Works (Lab Equipment Only)

• DiamondView (GIA/De Beers instrument): uses short-wave UV to image internal growth structure - different patterns for CVD, HPHT, and natural
• Photoluminescence spectroscopy: detects specific defect peaks (e.g., 737 nm SiV in CVD; Ni-related peaks in HPHT)
• FTIR spectroscopy: distinguishes Type Ia (most natural) from Type IIa (most CVD lab-grown)
• SYNTHdetect, GIA iD100, M-Screen+: specialized screening instruments that can flag suspect stones for further testing

The bottom line: if you bring a lab-grown diamond into a standard jewelry store and don't tell them, they will not be able to tell from looking at it. The GIA laser inscription on the girdle is the easiest tell - flip the stone, look at the inscription, and it will say "Laboratory-Grown" alongside the report number.

2026 Price Comparison

Because lab-grown diamonds are real diamonds, the price difference is not about quality - it is about supply economics. Lab-grown supply has scaled rapidly (production roughly tripled between 2022 and 2026), driving prices down ~70% in five years. Natural diamond supply is fixed by mining capacity, and prices remain elevated by the De Beers / ALROSA marketing model.

On a 1ct diamond, that's roughly $3,500–$4,500 saved by choosing lab-grown for the same look. On a 2ct diamond, the savings approach $20,000. For more, see How Much Does a Lab-Grown Diamond Cost and our natural vs lab-grown price comparison.

Resale Value: The Real Difference

Resale is where natural and lab-grown diamonds diverge meaningfully. Both lose substantial value at resale, but lab-grown loses more.

• Natural diamonds typically resell for 30–50% of retail price (i.e., lose 50–70% of retail value)
• Lab-grown diamonds typically resell for 5–20% of retail price (i.e., lose 80–95% of retail value)
• The reason: wholesale lab-grown prices are dropping ~10–20% per year, so the secondary market keeps reprice-ing downward

This is the strongest argument for natural diamonds if you view jewelry as a partial store of value - though even natural diamonds are a poor investment vehicle. For our deep dive into diamond resale economics, see Do Diamonds Hold Their Value?. The short answer: don't buy any diamond - natural or lab-grown - expecting financial return. Buy what you love at a price you can afford.

Ethics and Environmental Impact

Both natural and lab-grown diamonds have environmental and ethical footprints. Neither is perfectly "clean," but the impact profiles differ.

Natural Diamond Mining

• Open-pit and alluvial mining disturb ~80–100 m² of land per polished carat
• Energy: ~80–150 kWh per polished carat (mostly diesel)
• Water: ~480–500 liters per polished carat
• Kimberley Process certification reduces (but does not eliminate) conflict-diamond risk
• Mining communities can benefit economically (e.g., Botswana) when royalties are well-managed

Lab-Grown Diamond Production

• Land disturbance: ~5–7x lower than mining
• Energy: ~250–750 kWh per polished carat (high - CVD/HPHT both energy-intensive)
• Water: ~70 liters per polished carat (much lower than mining)
• Climate impact depends on grid: a lab-grown stone produced on Indian coal grid can have a higher carbon footprint than a mined stone; one produced on hydro or solar can have a much lower one
• Zero conflict-diamond risk; no mining communities involved (positive for environmental impact, neutral-to-negative for economic development arguments)

The honest summary: lab-grown wins on land use, water, and conflict risk; the carbon comparison depends entirely on the energy grid of the producing facility. Buying lab-grown from a producer with verified renewable energy (e.g., Diamond Foundry, VRAI) gives you the lowest-impact diamond available today.

Marketing Myths Debunked

The natural diamond industry has spent significant marketing dollars trying to differentiate "real" (mined) from "fake" (lab-grown) diamonds. Most of these claims do not survive contact with the science.

Frequently Asked Questions

Are lab-grown diamonds real diamonds?

Yes - definitively. Lab-grown diamonds are 100% real diamonds, identical in chemical composition (pure carbon), crystal structure (cubic lattice), and every physical and optical property to mined diamonds. This is the official position of the FTC (which removed "natural" from the definition of diamond in 2018), the GIA, IGI, AGS, and every major gemological authority. The only differences are origin and price.

Will a jeweler be able to tell my ring is lab-grown?

No - not without specialized lab equipment. A standard 10x loupe, microscope, diamond tester, or visual inspection cannot distinguish lab-grown from natural. Only instruments like the GIA DiamondView, photoluminescence spectroscopy, or the GIA iD100 can confirm origin. The one easy tell is the laser inscription on the girdle: GIA inscribes "Laboratory-Grown" alongside the report number, visible under magnification.

Do lab-grown diamonds last forever?

Yes. Diamond is the hardest natural material (Mohs 10) and one of the most chemically stable forms of carbon. Lab-grown diamonds will not fade, cloud, yellow, or degrade under any normal wear conditions. They are just as permanent as mined diamonds and will last generations. The "they'll turn yellow" claim is a myth with no scientific basis.

Are lab-grown diamonds graded by the GIA?

Yes. The GIA has graded lab-grown diamonds since 2007 and uses the same 4Cs scale (Cut, Color, Clarity, Carat) as it uses for mined diamonds. Lab-grown reports are titled "Laboratory-Grown Diamond Report" and disclose the growth method (HPHT or CVD) and any post-growth treatments. IGI is even more dominant in the lab-grown segment, grading roughly 70% of certified lab-grown stones sold globally.

Why are lab-grown diamonds so much cheaper?

Because supply has scaled rapidly. Production capacity has roughly tripled since 2022, while natural diamond supply is fixed by mining capacity. Lab-grown is also not subject to the De Beers / ALROSA price-management system that historically supported natural diamond prices. In 2026, lab-grown sells for 60–85% less than identical-spec mined diamonds. See our guide to the lab-grown market for more.

Will lab-grown diamonds increase in value?

No - they will almost certainly continue to decline. Per-carat wholesale prices have dropped ~10–20% per year for five years as production capacity grows. Lab-grown should be viewed as a luxury consumable, not an investment. If resale value matters to you, natural diamonds are a better (though still imperfect) choice. For most buyers - who never sell their ring - this distinction is irrelevant. Buy what you love at a price you can afford. See Do Diamonds Hold Their Value? for the full picture.