Are Lab Grown Diamonds Real Diamonds: What the Science of Their Creation Proves

Lab grown diamonds are real diamonds. They share the same carbon crystal structure, the same refractive index, and the same hardness rating of 10 on the Mohs scale as diamonds pulled from the earth. The only meaningful difference is where the growth happened: underground over billions of years, or inside a controlled chamber over a few weeks.

That distinction matters less than most shoppers assume. The International Gemological Institute (IGI) grades lab grown diamonds using exactly the same 4Cs criteria it applies to mined stones, because the material being graded is the same material. What the science of CVD and HPHT production actually shows is that the process of formation does not change what a diamond is.

How does the HPHT method grow a diamond?

High Pressure High Temperature (HPHT) growth recreates the conditions found roughly 100 miles below the earth’s surface. A small diamond seed is placed inside a press alongside a carbon source, typically a graphite or metal flux mixture. The chamber is then brought to around 1,500 degrees Celsius and pressures exceeding 1.5 million pounds per square inch. Under those conditions, carbon atoms dissolve into the flux and migrate toward the cooler seed, bonding layer by layer into a crystal.

The result is a diamond with the same cubic crystal lattice as any mined stone. HPHT tends to produce crystals with a slightly yellowish or brownish tint unless the process is carefully controlled, which is why many HPHT stones are also used to color-treat lower-grade natural diamonds. But when grown under optimized conditions, HPHT produces gems that are chemically indistinguishable from their mined counterparts.

How does CVD diamond growth work?

Chemical Vapor Deposition (CVD) takes a different route to the same destination. A thin diamond seed wafer is placed inside a low-pressure chamber filled with a carbon-rich gas, usually methane mixed with hydrogen. Microwave energy or a hot filament breaks the gas molecules apart, freeing carbon atoms that then rain down onto the seed and crystallize into diamond, one atomic layer at a time.

CVD growth happens at much lower pressures than HPHT, which makes it easier to scale and control. The process tends to produce stones with fewer metallic inclusions, since there is no metal flux involved. CVD diamonds often have a slight brownish tint straight out of the reactor, which is typically removed with a short post-growth HPHT treatment. After that step, the crystal is optically and chemically the same as any other diamond.

Can gemologists tell a lab grown diamond apart from a mined one?

With the naked eye, no. Even trained gemologists cannot distinguish a lab grown diamond from a mined one by looking at it. Both have the same brilliance, fire, and scintillation because those optical properties come from the crystal structure, not the origin.

Specialized equipment can detect subtle growth patterns that differ between the two. HPHT diamonds sometimes show a characteristic cross-shaped strain pattern under polarized light. CVD diamonds can display fine parallel growth lines when examined under high magnification. Neither of these features affects appearance or durability. They are structural fingerprints of the growth method, not flaws. The GIA and IGI both require lab grown diamonds to be disclosed on grading reports, which is why reputable retailers include that documentation with every stone.

Does the science change how a lab grown diamond performs over time?

No. Because the crystal structure is identical, a lab grown diamond ages exactly the same way a mined diamond does: it does not. Diamond is the hardest natural material known, and that hardness is a property of the carbon lattice, not the growth environment. A lab grown stone will not cloud, scratch, or degrade under normal wear.

The one area where lab grown diamonds do differ in a practical sense is price. In 2026, a lab grown diamond typically costs 60 to 80 percent less than a comparable mined stone of the same cut, color, clarity, and carat weight. That price gap reflects production economics, not quality. You are buying the same crystal for less money because the supply chain is shorter and the raw material is more accessible.

Lab Grown Diamonds Are the Same Stone, Grown in a Different Place

The science is not ambiguous on this. Carbon atoms arranged in a cubic crystal lattice at a hardness of 10 are a diamond, regardless of whether the pressure and heat came from the earth’s mantle or a laboratory reactor. Both CVD and HPHT produce stones that meet every chemical and physical definition of diamond. IGI certification confirms this for individual stones, grading them on cut, color, clarity, and carat weight without adjusting the scale for origin.

For shoppers who want that confirmation built into their purchase, IGI Certified Round Lab Grown Diamond Stud Earrings from Ouros Jewels come with full documentation, so the science is on paper, not just in the description.

Frequently Asked Questions

Do lab grown diamonds test as real diamonds on a diamond tester?

Yes. Standard diamond testers measure thermal conductivity, and lab grown diamonds conduct heat exactly the same way mined diamonds do, because the crystal structure is identical. A basic tester will read a lab grown stone as a genuine diamond. Only specialized spectroscopic equipment can identify the growth origin.

Will a lab grown diamond lose its sparkle or value over time the way moissanite does?

A lab grown diamond will not lose sparkle. Its refractive index of 2.42 is identical to a mined diamond and does not change with age or wear. Moissanite has a different refractive index and a distinct optical signature. Lab grown diamonds do not behave like moissanite in any optical or physical sense.

Is an IGI-certified lab grown diamond the same as a GIA-certified one?

Both IGI and GIA grade lab grown diamonds using the same 4Cs methodology. The two labs use slightly different grading scales in practice, so a stone graded G/VS1 by IGI may not receive the exact same grades from GIA, but neither lab adjusts its standards based on whether a diamond is lab grown or mined. Certification from either is a credible quality guarantee.

Can a jeweler set a lab grown diamond in any ring setting designed for mined diamonds?

Yes. Because a lab grown diamond has the same hardness, dimensions, and physical properties as a mined diamond of the same cut, any setting designed for a mined stone will hold a lab grown stone of the same shape and carat weight without modification. There is no structural or mechanical difference that would require a different prong style or setting depth.

Are colored lab grown diamonds real diamonds too?

Yes. Colored lab grown diamonds, including pink, blue, and yellow varieties, are real diamonds with trace elements or structural modifications that produce color, the same mechanism that creates color in mined fancy diamonds. Pink lab grown diamonds, for example, are created by introducing specific conditions during growth that produce the same color centers found in natural pink diamonds from mines like Argyle.