Lab-Grown vs Natural Diamonds: What Is the Same, What Is Different and What Each Costs in 2026

By Cameron Malakan, owner of Clairamor and third-generation jeweler · Published January 27, 2023 · Updated October 12, 2026

A lab-grown diamond and a natural diamond are the same material: carbon atoms bonded in the same crystal, with the same hardness, the same sparkle and, in GIA's words, nearly the same chemical, optical and physical properties. The difference is where the crystal grew, in a chamber over weeks or in the earth's mantle over a billion years or more, and what that does to the price. On October 12, 2026 a 1 carat lab-grown round of D to G color and IF to VS2 clarity started at $651 in Clairamor's picker and a 2 carat at $1,199, while a 1 carat natural diamond averaged $3,898 on Rapaport's data in September and $4,722 on StoneAlgo's index on October 10; in 2025, 61 percent of engagement rings sold in the United States held a lab-grown center stone. Everything Clairamor sells is lab-grown. This guide sets the two side by side without the sales pitch: what a lab-grown diamond is under the trade's rules, how each kind forms, what is identical and what is not, how a laboratory tells them apart, how they are graded, what each costs in 2026 and where the prices are going, the honest answer on resale value, the sustainability question, and who should choose which. Our engagement ring cost guide sets the average lab-grown ring ($4,300) against the average natural one ($7,000) and shows what each budget buys.

Lab-grown vs natural diamonds at a glance

What a lab-grown diamond is, and what it is not

A diamond is carbon whose atoms are bonded into a particular cubic crystal, and that structure, not the place it formed, is what makes it the hardest material in ordinary use, what gives it its refractive index of 2.42 and its white sparkle, and what makes it a diamond. A lab-grown diamond has that structure, grown from a diamond seed in a machine rather than in the mantle, which is why the Gemological Institute of America describes the two as having "nearly the same chemical, optical and physical properties" and why GIA, IGI and HRD grade lab-grown stones with the same instruments and the same scales they use for mined ones. In 2018 the Federal Trade Commission, which writes the rules for how jewelry may be described in the United States, removed the word "natural" from its definition of a diamond, so that the definition now covers both. The same rules say how a lab-grown stone has to be sold: as laboratory-grown, laboratory-created or [maker]-created, or with another term that clearly and conspicuously says it was not mined; "cultured" only with one of those words beside it; and never as real, genuine, natural or precious, words the Guides keep for the mined stone, so that an unqualified "diamond" still means a natural one. That is the honest shape of the answer to "are lab-grown diamonds real": they are diamonds, chemically and by regulation, and a seller who calls them natural, or who sells them without saying they were grown, is breaking the rules. We say lab-grown on every listing, every report says it, and the girdle of every stone is inscribed with it.

What a lab-grown diamond is not is a simulant. Moissanite is silicon carbide and cubic zirconia is zirconium dioxide; both sparkle, neither is carbon, and a laboratory separates them from diamond in seconds by their optical and physical properties, which is why a thermal diamond tester, the pen a jeweler touches to a stone, passes a lab-grown diamond and fails a cubic zirconia. Our moissanite vs lab-grown diamond guide compares the one simulant worth comparing, with hardness, fire and prices at the same size. The names you will meet for a lab-grown stone are all the same thing: lab-created, lab-made, man-made, grown, cultured (with a qualifier) and synthetic, which the FTC dropped from its recommended list in 2018 because shoppers may read it as fake, though the trade body CIBJO went the other way in 2026 and made it the sole descriptor in its standards. Whatever the word, the report settles it: a laboratory report for a lab-grown diamond says laboratory-grown on its face, states whether the stone was grown by HPHT or CVD, and notes any treatment applied after growth.

How each kind of diamond forms

A natural diamond crystallized in the mantle, 150 kilometres and more beneath the surface, where the pressure and heat are right for carbon to take the diamond structure, and most of them did so between one and three billion years ago; they reached the surface in the volcanic eruptions that left the kimberlite pipes miners dig today. On the way they trapped whatever was around them, which is why a mined stone's inclusions are garnet, olivine and other minerals, and why most mined diamonds in jewelry stores sit in the VS to SI clarity bands. A lab-grown diamond is made by one of two processes that GIA describes in detail. In high-pressure, high-temperature growth, HPHT, a capsule holding a carbon source and a mixture of metals is heated to 1,300 to 1,600 °C under 5 to 6 gigapascals of pressure, the conditions 150 to 190 kilometres down, and carbon crystallizes onto a seed; the metal is a catalyst, and tiny flecks of it are the characteristic inclusion of an HPHT stone. In chemical vapor deposition, CVD, the chamber is nearly a vacuum: a carbon-bearing gas, usually methane with hydrogen, is turned into a glowing plasma by microwaves at 700 to 1,200 °C, and carbon rains onto thin diamond seeds layer by layer, each layer copying the crystal beneath it, until a cubic block of diamond has grown. Either way the growth takes weeks, the rough is then cut and polished exactly as mined rough is, and a CVD stone is often put through an HPHT press afterwards to improve its color, which the report records as a post-growth treatment.

None of this is new. Union Carbide grew the first CVD diamond in 1952 and General Electric the first HPHT diamond soon after, for industrial use; GE grew the first gem-quality stones in the 1970s, and GIA published the first scientific study of them in 1971; manufacturers were growing commercial quantities of gem-quality crystals by the mid-1980s, small and yellowish at first; CVD reached gem quality in the 2000s; and colorless lab-grown diamonds arrived in the jewelry market in commercial quantities in the mid-2010s, which is the moment the engagement ring market began to change. Our page on how lab-grown diamonds are made walks through the CVD steps one by one.

What is the same and what is different

Read down the table and the pattern is plain: everything you can see, touch or wear is the same, and everything that differs is either invisible (the age, the atomic defects, the kind of inclusion a loupe finds) or on the price tag. That is why the rest of this guide spends its time on the price, on what a laboratory can and cannot tell you, and on the two questions people ask most, whether a lab-grown diamond holds its value and whether it is the more ethical choice, rather than on sparkle, where there is no difference to describe.

Can you tell a lab-grown diamond from a natural one?

Not without a laboratory. By eye the two are indistinguishable, a loupe shows nothing that identifies origin unless you know what a metallic HPHT inclusion looks like, and the thermal tester most jewelers keep on the counter measures heat conduction, which is a property of the diamond crystal, so it reads a lab-grown stone as diamond, which is correct. What separates them, in GIA's description, is the growth history written into the crystal: the species, distribution and concentration of the atomic-level irregularities and impurities that a crystal picks up as it grows differ between the mantle and a chamber, and between HPHT and CVD, and spectroscopy reads them. GIA built a desktop instrument, the iD100, that tells a natural diamond from a lab-grown one, a simulant or some treated stones in under two seconds, and the laboratories can also say which process grew a stone and whether it was treated afterwards. For a shopper the practical test is simpler, because the laboratories inscribe a lab-grown diamond's girdle with its report number and a lab-grown marking (GIA writes laboratory-grown in full), in letters too small for the eye and readable with a loupe, and the report carries the same number. Match the inscription to the report and you know what you have; our certification guide shows where to look, and we will show you the inscription on any stone we sell.

Two corollaries. First, a lab-grown diamond passes a diamond tester, so a tester cannot tell you that a stone is mined; only a laboratory can, which is why a natural diamond without a report is worth what a buyer is willing to assume about it. Second, nobody at a dinner table, a jeweler included, can tell which kind of diamond is on a hand, and the stories people tell about lab-grown stones looking "too perfect" or "glassy" describe cut and clarity, which vary in both kinds of diamond, not origin. If a diamond looks dull, it was cut badly or it is dirty; our cleaning guide fixes the second.

How lab-grown diamonds are graded

By the same 4Cs on the same scales. IGI, which reports nearly every stone in our picker, and HRD grade a lab-grown diamond's cut, color and clarity exactly as they grade a mined one, with the same eleven clarity grades, the same D-to-Z color scale and, on a round, the same cut grade, plus two lines a mined stone's report does not carry: the growth method, HPHT or CVD, and any post-growth treatment. Our diamond cut grade guide explains the cut grade and what each grade costs in lab-grown. GIA took a different path on October 1, 2025: its lab-grown report no longer gives color and clarity grades and instead classifies a stone as Premium, which needs D color, VVS2 clarity or better, Excellent polish and symmetry and an Excellent cut on a round, or Standard, with no assessment at all below VS2; the girdle is still inscribed laboratory-grown with the assessment number. The practical effect is that a GIA report with full grades on a lab-grown stone is an older report, and that IGI's are the ones that tell you the grade; our certification guide compares the laboratories. One more difference shows up in the grades themselves. Because grown crystal runs clean, the grades a mined-diamond buyer pays dearly for are the ordinary stock of a lab-grown feed: of the 40,531 stones between 1 and 3 carats in our picker on October 12, 2026, 20 percent were Internally Flawless, 29 percent VVS1, 29 percent VVS2, 18 percent VS1 and 3 percent VS2, and D was the most common color among the rounds. Our clarity chart prices each grade, and the 4Cs page covers all four.

What lab-grown and natural diamonds cost in 2026

The price is where the two kinds of diamond part company, and the gap has widened every year since colorless lab-grown stones reached the market. The table puts three sources side by side: the least expensive lab-grown round of each weight in our picker on October 12, 2026, D to G color and IF to VS2 clarity; the market average for a lab-grown stone of that weight on StoneAlgo's index, a price tracker that aggregates online listings, as of October 10; and StoneAlgo's average for a natural round of the same weight on the same day. The last column is what the lab-grown stone makes with our $950 solitaire in 14k gold.

Our picker: the least expensive round of each weight on October 12, 2026 (a 1.00 D VS2, 1.50 G VS2, 2.03 G VS2, 3.15 G VS1, 4.02 G VVS2 and 5.01 G VVS2), before the setting. Market averages from StoneAlgo's diamond price pages as of October 10, 2026, which average online listings across all grades: lab-grown 1 carat $512 (its 1 carat range ran $504 to $568), 1.5 carat $728, 2 carat $1,050, 3 carat $1,661; natural round 1 carat $4,722 and 2 carat $20,012. Rapaport Group data reported by CNBC on September 26, 2026 put the average 1 carat natural stone at $3,898. A market average is not a like-for-like price, since it mixes every grade; the like-for-like CNBC found the same month was $450 for a near-colorless VVS lab-grown stone with an excellent cut against $2,800 to $3,200 for a natural stone of the same specifications.

Three readings. The first is the scale of the gap: at 1 carat the natural average is six to nine times the lab-grown price, and at 2 carats, where natural prices climb steeply with rarity and lab-grown prices climb gently with weight, it is seventeen to nineteen times, so the money that buys a 1 carat natural solitaire buys a 5 carat lab-grown one with change, which is a choice almost nobody could make ten years ago. The second is the direction. Both prices are falling: on StoneAlgo's index lab-grown diamonds were down 27 percent in the year to October 2026 and natural diamonds 18 percent, and CNBC reported in September that a 1 carat natural stone had lost 51 percent of its 2021 average of $8,007, with a glut of mined rough and the shift to lab-grown both to blame; the discount of lab-grown to natural was about a quarter in 2019 and about 87 percent in 2026. The third is what the shape of lab-grown pricing means for a buyer: the price per carat falls as the stone grows, $651 for a 1 carat round in our picker and about $542 a carat for the 5 carat, which is the opposite of mined pricing, so the question a lab-grown buyer faces is not what they can afford but how much hand they want the stone to cover; our carat size chart shows every weight on a finger, the lab-grown diamond price guide explains what moves the numbers, and the price calculator estimates any combination.

Do lab-grown diamonds hold their value?

No, and neither do natural diamonds, which is the part the question usually leaves out. A diamond is not an investment: there is no spot market for it, no two stones are alike, and a stone offered for resale often sits for more than a year and then sells for less than half of what it cost at retail, which is the picture CNBC drew from CaratX's data and from jewelers' own buy-back pages in September 2026, and which a New York jeweler put plainly to them, saying that no one should buy a diamond thinking there is a financial investment aspect to it. Natural prices have fallen by half in five years; lab-grown prices have fallen further and faster, because the supply is made rather than found and the cost of making it keeps dropping, so a lab-grown stone bought today will be worth less in money terms in five years, and the one bought five years ago already is. The honest way to think about it is that a diamond's value is the years it is worn, and on that measure the two kinds are identical: the lab-grown stone sparkles the same, lasts the same, is insured the same, and cost a fraction as much to begin with, which is money that stayed in your pocket rather than in a stone whose resale price was never going to be what you paid. What you should do is insure it at its replacement value, which is why every ring we sell comes with an appraisal; our page on insuring a lab-grown diamond covers how. If you want something that holds its value, the jeweler CNBC quoted had the right answer: buy the ring to wear and put the savings somewhere that is built to hold value.

Sustainability and ethics, honestly

Lab-grown diamonds are usually sold as the ethical choice, and the case is real but it is narrower than the marketing. The clear part is sourcing: a lab-grown diamond comes from a known factory under a known owner, so the question that hangs over a mined stone, whether it funded a conflict or passed through a mine with a bad record, does not arise, and the Kimberley Process that certifies mined diamonds as conflict-free covers only rough diamonds and only one kind of conflict. The clear part on the other side is that a mine moves earth, uses water and burns diesel on a scale a growing chamber does not. The honest part is the electricity: growing a diamond takes weeks of high power, and a stone's carbon footprint depends almost entirely on the grid that fed the chamber, so a lab-grown diamond grown on hydroelectric or solar power is far cleaner than a mined one and a stone grown on coal may not be. Our sustainability page covers what that means for the stones we sell: every one grown rather than mined, graded by an independent laboratory, and sold with its origin on the report and on the girdle.

Durability, care and how long a lab-grown diamond lasts

As long as a natural one, which is to say longer than anything else you will own. The crystal is the same, so a lab-grown diamond is 10 on the Mohs scale, scratched only by another diamond, and it does not cloud, fade, yellow or wear; the idea that a grown stone dulls with time comes from confusing it with cubic zirconia, which does, and from rings that simply need cleaning. What wears is the setting: prongs thin, bands scratch, rhodium plating on white gold wears through, and those are the same on any ring with any stone. Our page on how long lab-grown diamonds last goes through it, our cleaning guide keeps the sparkle where it belongs, and the rule for every ring we make is the same whatever the stone: take it off for the gym, the garden and any work with tools or ropes, and have the prongs checked when the ring is cleaned. Every ring carries a lifetime warranty against manufacturing defects, comes with an appraisal for insurance, and includes one complimentary resize within 100 days for clients in the USA.

Lab-grown or natural: who should choose which

Choose a lab-grown diamond if the ring is for wearing and the money matters, which is most people: you get the same stone, graded to the same scales, at a sixth to a twentieth of the price, and the difference buys a bigger stone, a better setting, or something that is not a ring at all. Choose a natural diamond if its age and rarity mean something to you that a grown stone cannot, if you want the one thing a laboratory cannot make, which is a billion-year history, or if you are buying at the top of the market where a large, rare natural stone is bought and sold among collectors; those are real reasons, and none of them is sparkle, durability or beauty, where there is nothing to choose. Do not choose a natural diamond because it holds its value, because it does not reliably, or because a lab-grown one is "fake", because it is not, or because someone will be able to tell, because no one can. And whichever you choose, buy it with a laboratory report and an inscription that match, because that is the only thing that tells you what you bought.

Where Clairamor fits

Everything Clairamor sells is lab-grown, and we say so on every listing, every report and every girdle. The diamond comes from our picker, where every stone is D to G in color and IF to VS2 in clarity, Ideal to Very Good in cut, listed with its measurements, its IGI, GIA or HRD report and a video, so there is no grade in our inventory that is not clean to the eye and white on the hand, and the decision you are left with is the size and the shape; on October 12, 2026 a 1 carat round started at $651, a 2 carat at $1,199, a 3 carat at $1,698 and a 5 carat at $2,711, and there were 40,531 stones between 1 and 3 carats to choose from. Every setting price on our site is the setting without the center stone, from $950 for the solitaire in 14k gold, so a finished 1 carat round solitaire started at $1,601 that day and a 2 carat at $2,149. We chose lab-grown for the same reason most of our clients do: the stone is the same, the price is not, and we would rather you wore 2 carats you can see than paid for a billion years you cannot. Buy the size you want, take the report and the inscription as your proof, and spend what you save on the life around the ring.

Choose a diamond Engagement rings Price calculator

Torn between 2 carats lab-grown and 1 carat natural, or between two sizes of the same stone? Book a design consultation.

Frequently asked questions

Are lab-grown diamonds real diamonds?

They are diamonds: carbon in the diamond crystal, with the same hardness and sparkle as a mined stone, and the FTC removed the word natural from its definition of a diamond in 2018. The same rules say a lab-grown stone must be sold as laboratory-grown or laboratory-created and never described as natural, genuine or real, words kept for mined stones. Clairamor says lab-grown on every listing, report and girdle.

What is the difference between lab-grown and natural diamonds?

Origin and price. A natural diamond crystallized in the mantle one to three billion years ago; a lab-grown diamond was grown from a seed in weeks, by HPHT or CVD. Chemically, optically and physically they are nearly identical, and only a laboratory can tell them apart. On October 12, 2026 a 1 carat lab-grown round started at $651 in Clairamor's picker; a 1 carat natural stone averaged $3,898 to $4,722.

Can a jeweler tell a lab-grown diamond from a natural one?

Not by eye, not with a loupe and not with the thermal tester on the counter, which reads a lab-grown stone as diamond, correctly. Telling them apart takes laboratory instruments that read the crystal's atomic-level defects; GIA's iD100 does it in under two seconds. The practical check is the girdle, where the laboratories inscribe a lab-grown stone's report number and a lab-grown marking, readable with a loupe.

Do lab-grown diamonds pass a diamond tester?

Yes. A thermal diamond tester measures how fast a stone conducts heat, which is a property of the diamond crystal, so a lab-grown diamond passes exactly as a mined one does, and a cubic zirconia fails. A tester therefore proves a stone is diamond, not that it is mined. Only a laboratory can establish origin, so a stone sold as natural without a report is worth whatever the buyer assumes.

How are lab-grown diamonds made?

By one of two processes. HPHT heats a capsule of carbon and metal to 1,300 to 1,600 degrees Celsius under 5 to 6 gigapascals, the conditions 150 to 190 kilometres down, and carbon crystallizes onto a seed. CVD turns methane and hydrogen into a microwave plasma at 700 to 1,200 degrees in a near-vacuum, and carbon settles onto seeds layer by layer. Growth takes weeks; then the rough is cut.

How much cheaper are lab-grown diamonds than natural?

A great deal, and more every year. On October 12, 2026 a lab-grown round in Clairamor's picker was $651 at 1 carat, $1,199 at 2 and $2,711 at 5; StoneAlgo's index put a natural 1 carat round at $4,722 and a 2 carat at $20,012. StoneAlgo puts lab-grown about 87 percent below natural, against a quarter below in 2019; CNBC's like-for-like in September 2026 was $450 against $2,800 to $3,200.

Do lab-grown diamonds hold their value?

No, and natural diamonds do not reliably either. Resale stones often sit for more than a year and sell for less than half of retail, natural prices have fallen by half since 2021 and lab-grown prices have fallen further, 27 percent in the year to October 2026. Buy either diamond to wear, insure it at its appraised value, and keep what a lab-grown stone saves somewhere built to hold value.

Are lab-grown diamonds more ethical or sustainable?

On sourcing, yes: a grown stone comes from a known factory, so the conflict and labor questions over a mined stone do not arise, and nothing is dug up. On carbon it depends on the electricity that fed the chamber: a stone grown on hydro or solar power is far cleaner than a mined one; one grown on coal may not be.

How long do lab-grown diamonds last?

As long as a natural diamond, which is longer than anything else you own. The crystal is the same, 10 on the Mohs scale and scratched only by another diamond, and it does not cloud, fade or yellow; a dull ring needs cleaning or has a worn setting, not a worn stone. What wears is the metal: prongs thin and rhodium wears, so have the prongs checked at each cleaning.

Is HPHT or CVD better?

Neither, once the stone is graded. Both make the same crystal; the differences are in the rough and the inclusions, metal flecks in an HPHT stone and pinpoints or graining in a CVD stone, and CVD stones are often HPHT-treated afterwards to improve color, which the report records. Buy on the report's cut, color and clarity grades and the stone's video, not on the growth method.

What are the disadvantages of lab-grown diamonds?

Three honest ones. Resale value is low and falling, so the stone is a purchase, not an asset. The price keeps dropping, so the same stone will cost less next year, which is good for the next buyer. And a lab-grown stone has no geological age or rarity, which matters to some people and not to others. Sparkle, hardness, durability and grading are the same as a mined diamond's.

Does Clairamor sell natural diamonds?

No. Every diamond Clairamor sells is lab-grown, D to G in color and IF to VS2 in clarity, graded by IGI, GIA or HRD and listed with its report and a video, and every setting is priced without the center stone, from $950 for the 14k solitaire. On October 12, 2026 a finished 1 carat round solitaire started at $1,601 and a 2 carat at $2,149.

Related reading

• Moissanite vs lab-grown diamond: the honest comparison
• Diamond certification: GIA vs IGI, and how to read a report
• Diamond clarity chart: all 11 grades from Flawless to I3, what you can see and what each costs
• Diamond color scale: D to Z chart, what you can see and what each grade costs
• Diamond carat size chart: 0.5 to 5 carats in millimeters, on the hand and in lab-grown prices
• How big is a 3 carat diamond? Size on the hand, price and why not bigger
• Round brilliant engagement rings: cut grade, sizes, settings and prices
• Solitaire engagement rings: the complete guide to prongs, heights, shapes and prices
• How to clean an engagement ring at home: diamonds, gold, platinum and pavé
• How are lab-grown diamonds made?
• How long do lab-grown diamonds last?
• Can you insure a lab-grown diamond?
• The sustainability of lab-grown diamonds
• Lab-grown diamond prices in 2026: what a lab-grown diamond costs by carat, shape, color, clarity and cut
• Diamond price calculator
• Diamond cut grade chart: Ideal vs Excellent vs Very Good, what each costs and how a diamond is cut
• How much does an engagement ring cost in 2026? The average, how much to spend and what a lab-grown ring costs