What Is a Lab Grown Diamond? A Buyer's Guide
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If you've been shopping for an engagement ring lately, you've probably run into the term more than once, often attached to a price that looks lower than you'd expect for a diamond that size. Here's what a lab grown diamond actually is, how it's made, and what matters when you're deciding whether one belongs on your hand.
Quick Answer
A lab grown diamond is a diamond grown inside a laboratory using technology that reproduces the pressure and temperature conditions that form diamonds underground. It has the same carbon crystal structure, hardness, and optical properties as a mined diamond. The difference is where and how it formed, not what it's made of. The Federal Trade Commission and gemological labs like GIA and IGI classify it as a real diamond, not a simulant.
Key Takeaways
- A lab grown diamond has the same chemical composition (pure carbon), crystal structure, and hardness as a mined diamond; it isn't a diamond substitute.
- Two production methods exist: HPHT (High Pressure High Temperature) and CVD (Chemical Vapor Deposition), each producing genuine diamond crystals through different processes.
- Standard grading, including cut, color, clarity, and carat, applies to lab grown diamonds exactly as it does to mined ones.
- The FTC requires sellers to clearly disclose a diamond's lab origin using terms like "lab-grown" or "laboratory-created" placed directly next to the word "diamond."
- Lab grown diamonds typically cost significantly less than comparable mined diamonds, but that price gap can affect resale value, so buying for personal enjoyment rather than as a financial investment is the more realistic framing.
- Certification from an independent lab (commonly IGI) confirms the diamond's grading and origin, and is worth verifying before you buy.
What Is a Lab Grown Diamond?
A lab grown diamond is exactly what the name says: a diamond created in a controlled lab setting instead of forming naturally in the earth over a long geological timescale. Once it exists, though, it's not a different material sitting next to a diamond in a case. It's carbon, arranged in the same crystal lattice, at the same hardness (10 on the Mohs scale), with the same refractive index and fire that make a diamond sparkle.
This is the point that trips people up. A cubic zirconia or moissanite is a diamond simulant, a different mineral shaped to look like a diamond. A lab grown diamond isn't imitating anything; it's the same substance a mined diamond is, produced on a much shorter timeline. Gemological bodies including GIA and IGI grade lab grown stones on identical scales to mined ones, and U.S. law backs this up: the FTC's Jewelry Guides define "diamond" to include both natural and lab-created stones, provided the lab origin is disclosed.
That disclosure requirement is worth knowing as a shopper. Under current FTC guidance, a seller has to place a qualifier, such as "lab-grown," "laboratory-created," or a brand-specific version like "[Company]-created," immediately next to the word "diamond," not buried in fine print elsewhere on the page. If a listing just says "diamond" with no qualifier, it should be a mined stone.
How Are Lab Grown Diamonds Made?
There are two commercial methods, and they produce diamonds with slightly different starting characteristics.
HPHT (High Pressure High Temperature). A small diamond seed is placed in carbon material and exposed to extreme pressure and heat, conditions that approximate what happens tens of miles underground, just compressed into a controlled chamber. Carbon atoms bond to the seed and build outward into a larger crystal over days to weeks.
CVD (Chemical Vapor Deposition). A diamond seed is placed in a sealed chamber filled with carbon-rich gas. The gas is heated until carbon atoms separate from it and deposit onto the seed, building the crystal layer by layer. CVD is the more common method used for jewelry-grade stones today because it offers more control over the final color and clarity outcome.
Neither method is faster or "less real" than the other; they're different engineering paths to the same result, a diamond crystal that then gets cut and polished the same way a mined rough diamond would be.
Lab Grown vs. Natural Diamonds
| Factor | Lab Grown Diamond | Natural (Mined) Diamond |
|---|---|---|
| Origin | Grown in a lab over weeks to months | Formed underground over roughly 1–3 billion years |
| Chemical composition | Pure carbon, diamond crystal structure | Pure carbon, diamond crystal structure |
| Hardness | 10 on the Mohs scale | 10 on the Mohs scale |
| Visual appearance | Indistinguishable to the naked eye | Indistinguishable to the naked eye |
| Detection | Requires specialized lab equipment to confirm origin | Requires specialized lab equipment to confirm origin |
| Typical pricing | Generally lower per carat than a comparable mined stone | Generally higher per carat for equivalent specs |
| Certification | Graded by GIA, IGI, and others; origin disclosed on the report | Graded by GIA, IGI, and others |
| Best suited for | Buyers prioritizing size, budget, or supply-chain transparency | Buyers prioritizing natural origin and traditional resale markets |
The one meaningful difference that shows up on a lab report is trace growth patterns and, in some cases, tiny metallic inclusions from the growth process (more common in HPHT stones). These are details a jeweler's loupe won't catch, but that lab equipment specifically built to detect them can identify. Visually and structurally, the two are the same material.
How Lab Grown Diamonds Are Graded and Certified
Grading works the same way for both types of diamonds: the Four Cs still apply.
- Cut: how well the diamond's proportions and facets direct light, which drives brilliance more than any other factor.
- Color: graded on the same D-to-Z scale, where D is colorless and grades increase as more yellow or brown tint appears.
- Clarity: graded from Flawless down through Included, based on the number, size, and visibility of internal or surface characteristics.
- Carat: a measure of weight, not a direct measure of visual size (two diamonds of the same carat weight can look different in diameter depending on cut proportions).
For certification, IGI has become the most widely used lab for grading lab grown diamonds, alongside GIA, which certifies both natural and lab grown stones. A certificate should state the diamond's grading results and clearly identify it as laboratory-grown. This is the document to check for before you buy, since it's your independent confirmation of what you're actually getting.
Lab Grown Diamonds vs. Moissanite
Because they're often shown side by side in jewelry (including in mixed-stone pieces), it's worth being clear that moissanite is a different mineral entirely: silicon carbide, not carbon. It's durable (9.25 on the Mohs scale) and has more fire than a diamond, meaning it throws more colorful flashes of light, which some buyers like and others find less traditional-looking than diamond's brighter white sparkle. Moissanite is also less expensive than a lab grown diamond of comparable size. Neither is "better" outright; they're different materials suited to different preferences and budgets, and Luvcut's Rare Finds collection includes pieces that pair the two so you can compare them directly.
Pricing and Value: What to Expect
Lab grown diamonds are typically less expensive than mined diamonds of equivalent size and grade, largely because their supply isn't constrained by mining and extraction. That price difference is real and consistent across the market, but it comes with a trade-off worth understanding upfront: the resale market for lab grown diamonds is newer and less established, and because retail prices are already lower, resale offers tend to be a smaller fraction of the original purchase price than what's typical even for mined diamonds (which themselves rarely resell at full retail). If you're buying a diamond with resale value as a primary goal, this is a real consideration. If you're buying a diamond to wear and love, the lower entry price generally lets you get a larger stone, a higher color and clarity grade, or both, for the same budget.
What to Check Before You Buy
- Confirm the certification. Ask which lab graded the stone (IGI and GIA are the most recognized) and that the report explicitly states lab origin.
- Read the color and clarity grades, not just the marketing copy. "Excellent" and "premium" aren't grading terms; D–F color and VVS–VS clarity are.
- Check the cut grade specifically. A diamond can have great color and clarity and still look flat if it's poorly cut.
- Ask how the stone was made, if you're curious. HPHT and CVD stones can differ slightly in typical inclusion types, though this rarely affects appearance.
- Don't confuse "lab grown diamond" with "diamond simulant." Cubic zirconia and moissanite are not diamonds and shouldn't be priced or marketed as one.
At Luvcut, every lab grown diamond is graded to a standard of D–F color and VVS–VS clarity with an excellent cut, and ships with independent certification confirming those specifications: the same checklist above, already met before the piece reaches you. You can browse the full range by shape, including round, oval, emerald, and pear cuts, or start a custom design if you have a specific stone and setting combination in mind.
Frequently Asked Questions
Are lab grown diamonds real diamonds?
Yes. A lab grown diamond has the same chemical composition, crystal structure, and physical properties as a mined diamond. Gemological labs and the FTC classify it as a diamond, distinct from simulants like cubic zirconia, which are made of different materials entirely.
How are lab grown diamonds made?
They're grown using one of two methods: HPHT, which applies extreme heat and pressure to a diamond seed, or CVD, which builds a diamond crystal layer by layer from carbon-rich gas in a heated chamber. Both produce genuine diamond crystals that are then cut and polished like mined rough.
Can a jeweler tell a lab grown diamond from a mined one just by looking?
No, not with the naked eye or a standard loupe. Distinguishing the two requires specialized equipment designed to detect subtle growth-pattern differences, which is why certification from an independent gem lab matters.
Do lab grown diamonds have certification?
Reputable ones do. Labs like IGI and GIA grade lab grown diamonds on the same cut, color, clarity, and carat scale used for mined diamonds, and the certificate discloses the lab origin.
Are lab grown diamonds cheaper than mined diamonds?
Generally yes, often by a significant margin for a comparable size and grade, since production isn't limited by mining supply. Exact price gaps vary by size, quality, and market conditions.
Do lab grown diamonds lose value?
Resale value is typically lower relative to original purchase price than many buyers expect, partly because lab grown retail prices are already lower and partly because the resale market is still developing. Most jewelry, lab grown or mined, isn't a strong resale investment.
Is a lab grown diamond the same as moissanite?
No. Moissanite is a different mineral (silicon carbide) with its own optical properties, including more colorful fire than diamond. A lab grown diamond is chemically identical to a mined diamond; moissanite is not.
What's the difference between HPHT and CVD diamonds?
HPHT uses extreme pressure and heat to grow a diamond from a seed; CVD builds the crystal from carbon gas in a heated chamber. Both produce real diamond, though the two methods can leave slightly different trace characteristics detectable by lab equipment.
Does carat weight tell you how big a lab grown diamond looks?
Not directly. Carat measures weight, and cut proportions affect how large a diamond appears face-up, so two stones of the same carat weight can look different in diameter.
What should I check before buying a lab grown diamond?
Verify the certification (ideally from IGI or GIA), confirm the color and clarity grades in specific terms rather than marketing language, and check the cut grade, since cut has the biggest effect on how the diamond actually looks.
Final Thoughts
A lab grown diamond isn't a compromise version of a diamond. It's the same material, made on a different timeline. The real decision points are practical ones: what grade and certification you're getting, how the price compares to a mined equivalent at the same specs, and whether you're buying primarily to wear something you love or to hold something with strong resale value. For most engagement ring shoppers, that trade-off leans clearly toward the lab grown option. If you're ready to look at specific stones and settings, Luvcut's engagement ring collection is organized by shape and style so you can compare options directly.