Lay a natural diamond, a lab-grown diamond and a moissanite side by side on a tray, and very few people can tell which is which. Yet they come from completely different places, they cost very different amounts, and they do not hold their value in the same way. Here is what separates them.
Where does a natural diamond come from?
A natural diamond is pure carbon. It crystallised more than a billion years ago, 150 to 200 kilometres below the surface, where the heat and pressure are immense. Volcanic eruptions later pushed these crystals up through narrow channels of rock that geologists call kimberlite pipes.
Miners reach them in three ways. Open-pit mines dig the pipe out from above, in huge stepped craters. When the pit gets too deep, tunnels follow the pipe underground. And where rivers or the sea have washed diamonds away from their source over millions of years, they are recovered from gravel beds, and off the coast of Namibia, even from the seabed.
In 2025 the world mined about 98.8 million carats of rough diamonds. Four countries produced most of them:
| Country | Rough production, 2025 |
|---|---|
| Russia | 31.5 million carats |
| Botswana | 15.5 million carats |
| Angola | 15.2 million carats |
| Canada | 14.1 million carats |
Botswana is home to Jwaneng, the richest diamond mine in the world by value, and to Orapa, the largest by surface area. In Siberia's Yakutia region, mines such as Jubilee and Udachny hold some of the biggest reserves on Earth.
How is a diamond grown in a laboratory?
A lab-grown diamond is not an imitation. It is the same carbon crystal, with the same hardness and the same sparkle. What changes is the time: a few weeks instead of a billion years. There are two ways to grow one.
HPHT (High Pressure, High Temperature). Graphite, a metal catalyst and a tiny diamond seed go into a large press. The press recreates the conditions deep inside the Earth, and the carbon crystallises around the seed.
CVD (Chemical Vapour Deposition). Thin diamond seed plates sit in a vacuum chamber filled with a carbon-rich gas. The gas is heated into a glowing plasma, and carbon atoms settle on the seeds, layer upon layer.
China is the largest producer and works mostly with HPHT presses, concentrated in Henan province. India works mostly with CVD reactors, around Surat, the city where most of the world's diamonds are also cut and polished. The United States grows diamonds by CVD as well, a technique that came out of its semiconductor industry.
What is moissanite, and how is it made?
Moissanite is not a diamond at all. It is silicon carbide, a different mineral. The French chemist Henri Moissan first found it in 1893, in fragments of the meteorite that formed Canyon Diablo crater in Arizona. In nature it is so rare that every moissanite you see in jewellery was made in a laboratory.
It is made by neither HPHT nor CVD. Silicon carbide powder is heated to well over 2,000 °C, until it turns straight into vapour without melting. The vapour settles on a cooler seed crystal and slowly grows into a single large crystal, which is then cut into gems. Put simply: HPHT and CVD turn carbon into diamond. This process turns silicon carbide into moissanite.
How do the three compare?
The numbers tell a clear story. Natural and lab-grown diamonds are physically the same stone: hardness 10, refractive index 2.42, dispersion 0.044. Moissanite is a little softer at 9.25, but it bends light more strongly (2.65 to 2.69) and splits it into colour about 2.4 times more, which jewellers call "fire".
Can you tell them apart by eye?
Natural from lab-grown: no. Not with the naked eye, and not with a jeweller's loupe either. It takes laboratory instruments.
Diamond from moissanite: sometimes. Moissanite throws more rainbow colour, and in direct sunlight a trained eye will notice it. Some people love that extra colour. Others prefer the cooler, whiter light of a diamond. Neither is wrong.
What about price and resale value?
Natural diamond is still the most expensive of the three, because nature sets the supply. A lab-grown diamond of the same size and quality usually costs a fraction of that, and its price has kept falling as more factories come online. Moissanite is the most affordable.
Resale is where the difference really shows. A natural diamond keeps part of its value. Lab-grown diamonds and moissanite can be produced in any quantity, so there is very little second-hand market for them. If you are buying a stone to wear and enjoy, that may not matter to you. If you are buying something to pass on, it matters a great deal.
So which one should you choose?
Choose a natural diamond if rarity, the story of the Earth and long-term value come first. Choose a lab-grown diamond if you want a true diamond, maybe a bigger one, on a smaller budget. Choose moissanite if you want the most sparkle for the least money. All three are hard enough to wear every day.
Quick answers
Is a lab-grown diamond a real diamond?
Yes. Same chemistry, same crystal structure, same physical properties. Only the origin is different.
Is moissanite a fake diamond?
It is not a diamond, but it is a genuine gemstone with its own character. It only becomes a problem when someone sells it as a diamond.
Which is the most durable?
Diamond, natural or lab-grown, at 10 on the Mohs scale. Moissanite follows at 9.25, more than enough for a ring worn daily.
In the next guide I explain how to read a grading report, which laboratories you can trust, and what to check before you buy.
Murat Bakış, Founder & Designer, Mu Design Jewelry · Ruse, November 2026
Sources: Kimberley Process Certification Scheme, Annual Global Summary 2025; GIA (Gemological Institute of America), Gems & Gemology research on laboratory-grown diamonds and gemmological data for diamond and synthetic moissanite.
