Are Lab-Grown Diamonds Real? The Truth You Need to Know

It is the most common question, and it deserves a clear, honest answer.

Are lab-grown diamonds real? Are they genuine gemstones, or just sophisticated imitations? Do they have the same sparkle, the same hardness, the same permanence as a diamond pulled from the Earth?

The answer is unequivocal. Lab-grown diamonds are real diamonds. They are not cubic zirconia. They are not moissanite. They are not glass. They are pure carbon, arranged in a perfect crystal lattice, identical in every meaningful way to a diamond that spent billions of years beneath the Earth's surface.

This article explains why, and answers every related question you might have.

What Makes a Diamond a Diamond?

To understand why a lab-grown diamond is real, we first need to understand what defines a diamond in the first place.

A diamond is defined by three things: its chemical composition, its crystal structure, and its physical properties.

Chemically, a diamond is pure carbon. Not carbon mixed with something else. Not carbon with impurities. Just carbon atoms, bonded together in one of the strongest configurations known to science.

Structurally, a diamond is a crystal. Its carbon atoms are arranged in a repeating, three-dimensional lattice called a cubic crystal system. This specific arrangement is what gives a diamond its unique properties — its hardness, its brilliance, its fire.

Physically, a diamond is the hardest naturally occurring material on Earth, scoring a perfect 10 on the Mohs scale of mineral hardness. It has a refractive index of 2.42, which is what makes light bend so dramatically inside the stone, creating its legendary sparkle. It has a dispersion of 0.044, which splits white light into the rainbow flashes known as "fire."

If a material is pure carbon, arranged in a cubic crystal lattice, with a hardness of 10, a refractive index of 2.42, and a dispersion of 0.044, then it is a diamond. It does not matter where it came from. It does not matter how long it took to form. It is a diamond by every scientific measure.

Lab-Grown Diamonds Pass Every Test

Lab-grown diamonds meet every single one of these criteria. They are 100 percent carbon. They have the identical cubic crystal structure. They score a 10 on the Mohs scale. Their refractive index is 2.42. Their dispersion is 0.044.

There is no scientific test that can say "this diamond is real" and "this diamond is not" based on these fundamental properties. Both pass. Both are diamonds.

The U.S. Federal Trade Commission, the government agency responsible for protecting consumers from deceptive marketing, ruled in 2018 that lab-grown diamonds are diamonds. The FTC specifically stated that it is deceptive to call a lab-grown diamond anything other than a diamond.

The Gemological Institute of America, the most respected diamond grading authority in the world, grades lab-grown diamonds using the exact same criteria — the 4Cs of Carat, Color, Clarity, and Cut — as mined diamonds. GIA issues grading reports for lab-grown diamonds that are identical in format to those for mined diamonds.

The International Gemological Institute does the same. So does every other major gemological laboratory.

If the FTC says they are diamonds, and GIA grades them as diamonds, and every physical test confirms they are diamonds, then they are diamonds.

Can Anyone Tell the Difference?

This is the practical question that matters to most people. If you wear a lab-grown diamond ring, will anyone know it was grown in a laboratory rather than mined from the Earth?

The answer is no.

Not a jeweler. Not a gemologist. Not your closest friend. Not even you. A lab-grown diamond is visually indistinguishable from a mined diamond. It sparkles the same way. It catches the light the same way. It looks exactly the same on your hand.

The only way to tell the difference is with specialized laboratory equipment — a spectrometer that can detect the subtle growth patterns unique to CVD or HPHT diamonds. This equipment costs tens of thousands of dollars and is only found in major gemological laboratories.

When you wear a lab-grown diamond, no one knows its origin except you.

What About Diamond Testers?

You may have seen a diamond tester — a small handheld device that jewellers use to check if a stone is a diamond. These testers work by measuring thermal conductivity. Diamonds conduct heat exceptionally well, while simulants like cubic zirconia do not.

Lab-grown diamonds pass a diamond tester without any issue. The device cannot distinguish between a mined diamond and a lab-grown diamond because their thermal conductivity is identical. The tester simply reads "diamond."

Are Lab-Grown Diamonds the Same as Cubic Zirconia?

No. This is one of the most persistent misconceptions, and it is important to clear it up.

Cubic zirconia is a completely different material. It is zirconium dioxide, not carbon. It has a different crystal structure. It is softer, scoring only 8 to 8.5 on the Mohs scale compared to diamond's 10. It has a different refractive index and a different dispersion, which means it sparkles differently. Over time, cubic zirconia can scratch, cloud, and lose its luster.

A lab-grown diamond will never scratch, never cloud, and never lose its brilliance. It is a diamond. Cubic zirconia is a simulant — a material that looks somewhat like a diamond but is not one.

Are Lab-Grown Diamonds the Same as Moissanite?

No. Moissanite is silicon carbide, not carbon. It is a different mineral altogether. It was first discovered in a meteor crater by the French chemist Henri Moissan in 1893.

Moissanite is a beautiful gemstone in its own right, with a higher refractive index than diamond, which gives it even more fire — sometimes described as a rainbow or disco-ball effect. But it is not a diamond. It has a different chemical composition, a different crystal structure, and different optical properties.

A lab-grown diamond is not moissanite. It is a diamond.

Do Lab-Grown Diamonds Last Forever?

Yes. A diamond is the hardest material on Earth, and this is true whether it was formed underground or in a laboratory. Your lab-grown diamond will not scratch, chip, or degrade over time. It will look exactly the same in fifty years as it does today.

This is one of the most beautiful properties of a diamond. It is eternal. It can be passed from mother to daughter, from generation to generation, without ever losing its brilliance.

What About the Emotional Value?

Some people worry that a lab-grown diamond somehow carries less emotional weight than a mined diamond. That it is less romantic. Less meaningful.

We believe the opposite is true.

A lab-grown diamond carries a story of human ingenuity. It represents decades of scientific research, centuries of gemological expertise, and a commitment to doing things differently. It says: I chose a diamond that aligns with my values. I chose a diamond that is beautiful, ethical, and transparent.

That is not a compromise. That is a conscious choice. And there is profound meaning in that.

The Bottom Line

Lab-grown diamonds are real diamonds. They are pure carbon, with the same crystal structure, the same hardness, the same brilliance, and the same fire as mined diamonds. They are certified by the same independent laboratories. They are indistinguishable to the naked eye, to a jeweler's loupe, and to a diamond tester.

They are not cubic zirconia. They are not moissanite. They are not an imitation. They are the result of advanced science and master craftsmanship, and they represent the future of fine jewelry.

At Made of Shine, we chose lab-grown diamonds not because they are cheaper, but because they are better. Better for the planet. Better for the people who produce them. Better for the woman who wears them, knowing her diamond left a trace of light, not a shadow.

Explore our collections and discover the brilliance of real, ethical diamonds.