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Sustainable lab grown diamonds

What are Lab Grown Diamonds?

Sustainably created gemstones that don’t displace land, wildlife or communities.


What Does Lab-Grown Diamond Mean?

Lab-grown diamond refers to a real diamond that has been artificially elaborated. However, these diamonds are chemically, structurally and physically identical to earth-mined diamonds. To such an extent that even gemologists cannot distinguish between them. 

The Stats

  • 100% real diamonds — formed in a laboratory setting, making them a more sustainable choice. 
  • 70-90% more financially accessible than an earth-mined diamond of the same characteristics. 
  • 52% of couples now choose lab grown diamonds for their engagement ring

The Science

What are Lab-Grown Diamonds?

Traditionally, diamonds are formed deep within the Earth’s mantle, where carbon atoms are subjected to intense heat and pressure, crystallising into the iconic cubic structure we know as diamond. These stones are then brought to the surface by deep volcanic eruptions — the starting point of conventional diamond mining.

However, earth-mined diamonds have a long history of issues. Their mining causes air and water pollution and, more worryingly, they have been embroiled in human rights violations since the very beginning.

So, what is a lab-grown diamond, and why might they be a better choice?

Using advanced technology, we can now recreate the natural formation of diamonds in a controlled laboratory environment. Two primary methods make this possible:

  • HPHT (High Pressure, High Temperature)
  • CVD (Chemical Vapour Deposition)

The result? A rough diamond that’s physically, chemically, and optically identical to one mined from the earth — but far more sustainable. Your jeweller will then polish and cut the diamond into the desired shape and set it in jewellery you’ll want to wear time and time again.


The Process

How Are Lab-Grown Diamonds Made

How are diamonds grown in a lab? Lab-grown diamonds are created using cutting-edge technology that replicates the intense natural conditions found deep within the Earth’s mantle, where traditional diamonds are formed.

How are Diamonds Grown in a Lab

High-Pressure, High-Temperature

One of the most common methods is HPHT (High Pressure, High Temperature). This process uses a compact but powerful machine to simulate the extreme environment beneath the Earth’s surface. Inside this apparatus, a carbon source is exposed to temperatures over 1300°C and pressures of around five gigapascals — that’s roughly 50,000 times the atmospheric pressure at sea level.

To put that into perspective, imagine the weight of 400 African elephants balanced on the tip of your finger. That’s the kind of crushing force needed to transform carbon into diamond. Under these conditions, the carbon atoms begin to bond in a precise cubic crystal structure, forming a rough diamond in just a matter of weeks.

This remarkable process enables us to grow diamonds that are physically and chemically identical to those mined from the Earth — but without the environmental and ethical concerns associated with traditional mining.

How are Diamonds Grown in a Lab

Chemical Vapour Deposition

CVD (Chemical Vapour Deposition) is a process that uses carbon-rich gases and energy to build a diamond layer by layer.

What are lab-grown diamonds made of? It starts with a diamond seed — a tiny sliver of diamond — placed inside a sealed CVD chamber. Then, a mixture of hydrogen and methane gases is introduced. When the chamber is charged with electrical energy, it creates a glowing plasma, like a miniature lightning storm.

Within this plasma, the molecular bonds of the gases break apart. Pure carbon is released and begins to settle onto the diamond seed, bonding with it atom by atom. Over time, this steady accumulation of carbon causes the seed to grow into a much larger, rough diamond.

The process is precise, efficient, and beautiful, allowing us to grow diamonds with the same brilliance and structure as those formed in the Earth, but with a significantly lighter footprint.

How are Diamonds Grown in a Lab

The End Result?

Both processes create a rough diamond that is chemically identical to an earth-mined diamond, without the associated ethical and environmental costs. In fact, after the polishing process, jewellers, gemologists and scientists cannot tell the difference between earth-mined and lab-grown diamonds, and they are graded in exactly the same way. Every time the lab-grown process is completed, a new, unique diamond is created, which is then polished and cut to reveal its own distinct clarity characteristics.


A Sustainable Future

Why We Love Lab-Grown Diamonds

At Fyne, we pledge to act sustainably, responsibly, and ethically - in the best interests of our planet and its communities. Our decision to use sustainable lab-grown diamonds is a crucial part of our commitment to the earth, and this is what makes them even more beautiful than their natural counterparts. 

Moreover, lab-grown diamonds offer a progressive and innovative alternative to the traditional market. Because it's a relatively new industry, the technology is constantly evolving and changing to make way for even better practices.

By choosing to use lab-grown diamonds, we can ensure our customers have the best, while we strive to implement the most sustainable processes.

A Diamond That Reflects Your Values

Lab-Grown vs Natural Diamonds

At first glance, you’d never know the difference — and that’s the point. Lab-grown diamonds are chemically and visually identical to those mined from the Earth. But their story is entirely different.

Instead of being extracted through destructive mining, lab-grown diamonds are created in controlled environments, thereby avoiding harm to ecosystems and communities. They offer the same brilliance and beauty, without the environmental cost or ethical questions.

In the end, it’s not just about sparkle — it’s about choosing a diamond that reflects your values.

Some of the ‘sustainable’ benefits of choosing a lab-grown diamond are:

The supply chain is both shorter and more transparent

Earth-mined diamonds are harvested in a long and obscure process that requires them to pass through many hands. This puts more of a burden on the planet (producing more carbon emissions) and makes diamonds expensive. Because the supply chain is shorter, lab-grown diamonds are a cheaper and more planet-friendly alternative that still guarantees the same quality. After all, diamonds shouldn't cost the earth.

They are ethical and ensure greater protection of human rights

The earth-mined diamond industry has a reputation for its unethical and shady practices. Typically, this can be issues such as slave labour, child labour, low wages, or community displacement to make way for mines. For example, have you ever heard of ‘blood diamonds’? These are diamonds mined in conflict zones, with oppressive work conditions, to fund the crimes of rebel movements in the region. The Kimberley Process was brought in to prevent these types of situations from occurring, however, its narrow wording and inconsistent application have left a lot to be desired.

In addition, accidents and other health hazards are commonplace in diamond mines. Workers are at risk of mine explosions, and other on-site risks, as well as exposure to pollution and toxins which can increase the risk of cancer, among other illnesses.

In contrast, lab-grown diamonds have zero impact on human life, as the lab ‘diamond growing process necessitates maintaining a clean room environment’. This results in ‘no life or occupational hazards to employees’.

The technology used is sustainable and environmentally-friendly

Mining earth diamonds requires a huge amount of fossil fuel and water, putting unnecessary pressure on the planet. In addition, the emissions produced from the traditional mining process cause both air pollution and groundwater pollution. In parts of Africa, where fresh water is scarce, this is a huge problem.

Take the ‘Marange Diamond Fields’ in Zimbabwe. Here, toxic waste (from the diamond mine) was being disposed of in the nearby river. This caused widespread damage such as biodiversity loss, crop damage, soil contamination, as well as health risks to workers as a result of exposure to toxins. This is just one of the many examples that showcase how unsustainable the traditional diamond mining process can be.

Lab Grown Diamond Gold Chain Bracelet

A Lab-Grown Solution.

Sustainable & Ethical

Lab-grown diamonds offer a sustainable, conflict-free, and eco-friendly solution. As technology evolves, the processes are only becoming more sustainable, with many suppliers using renewable energy.

By working with companies that are consciously reducing their carbon footprint, we are paving the way for future generations to think differently, live boldly, and redefine luxury.

Learn more about our sustainability values below.

Buying Guide: How to Choose a Lab-Grown Diamond

Use our top recommendations to choose the right diamond for you.

ONE: Understand the four Cs of diamonds

  • Cut: Choose from classic round brilliants to trendy oval, emerald, or pear cuts; the shape of your diamond affects both style and sparkle. Think about the overall look you want — timeless, modern, or somewhere in between.
  • Clarity & Colour: Refer to the charts above. While these aspects are on a scale, you don’t have to have a Flawless D diamond—an SI clarity with F colour might help you get more for your money and is still an extremely high-quality diamond.
  • Carat: The carat weight is often one of the first things people look for, and while it’s nice in theory to have a heavy rock, there are plenty of half-carat diamonds that are equally as beautiful as a one-carat one.

TWO: Check certification

When purchasing a diamond, ensure that the seller offers an IGI or GIA certification to verify that the diamond matches the description provided. At Fyne, we use IGI-certified diamonds in all of our jewellery.

THREE: TRUST YOUR SOURCE

Always buy from a retailer that clearly states their diamonds are lab-grown and ethically sourced. Reputable sellers will offer transparency, certification, and excellent customer service.

FOUR: HAPPY SHOPPING!

If you shop with these points in mind, you’ll find the diamond that suits you and your lifestyle best. Choose a diamond that feels like an extension of your personality; for a vintage feel, choose lower grade colours on whimsical rose gold or for something more classic, opt for icy diamonds on vibrant white gold.

Frequently Asked Questions

What is a lab grown diamond?

A lab-grown diamond is a diamond that is created through a controlled artificial process, rather than a gemmological process beneath the earth’s surface. Lab-grown diamonds have the same physical, chemical and aesthetic structures as mined diamonds.

Is there a chemical difference between a lab grown diamonds and a diamond mined from the Earth?

Put simply, no, there is no chemical or aesthetic difference between lab-grown diamonds and ones mined from the Earth.

Gemological labs (e.g., GIA, IGI, or HRD) can utilise very advanced and expensive machinery to detect slight differences in growth structures resulting from the respective environments of each diamond's formation process. This is like comparing the DNA of two different individuals – each will have unique characteristics but still be made up of the same chemical elements.

Are there other names for lab grown diamonds?

A lab-grown diamond is the most widely used term to describe diamonds that are grown through scientific processes and human intervention.

Other names include man-made diamonds, lab-created diamonds, above-ground diamonds, cultivated and cultured diamonds.

What is the difference between a lab grown diamond and cubic zirconia or moissanite?

Cubic zirconia is a simulant – it's made to look like a diamond, but its chemical, optical, and physical properties are not the same as those of a diamond. It is less durable and has less brilliance than a mined diamond or a lab-grown diamond.

Moissanite is also a simulant or imitation and is rarely found in nature, so most Moissanite is manufactured – it is the second hardest material after diamonds. Moissanite also refracts light differently, so its sparkle can look quite colourful, almost like a rainbow effect. In terms of price, Moissanite is significantly cheaper than lab-grown and earth-mined diamonds.

Are there grading reports (certificates) for lab grown diamonds?

All of the globally renowned gemmological labs issue lab-grown diamond reports that clearly state the "identification" or "origin" of the diamond as "laboratory-grown".

Lab diamonds above 0.30 carats can be graded for their colour, cut and clarity. To see an example of such a report, please visit the International Gemological Institute (IGI).

For our bridal jewellery, we work with IGI or GIA-certified lab diamonds.

Do you offer grading reports for Fyne Jewellery items?

Our daily wear collection does not come with a grading report; however, we do include a certificate of authenticity to confirm that your item is 100% genuine.

For our bridal jewellery, we always provide an additional gemmological grading report by a laboratory of your choice. We typically work with IGI-certified diamonds.

How is a lab grown diamond made?

There are two primary methods for creating lab-grown diamonds: HPHT and CVD. Read about each technological process below:

HPHT (High Temperature, High Pressure) mimics the environment that a natural diamond undergoes beneath the Earth’s surface. Temperatures exceeding 1300 degrees Celsius and pressures of 50,000 atmospheres are required to turn a carbon source into carbon atoms that start to form into a rough diamond crystal.

CVD (Chemical Vapour Deposition)is a process whereby a hydrocarbon gas is placed into a vacuum chamber over a tiny diamond seed. Carbon gases are heated to 800º Celsius, causing them to break apart from their carbon atoms, which then form on top of the diamond seed, slowly growing into a rough diamond crystal. 

How long does it take to grow a lab diamond?

It can take 3-6 weeks to grow a lab-grown diamond rough, although it may take longer.

Do lab grown diamonds test as real diamonds?

Yes. When using a diamond tester, lab-grown diamonds test as real because their physical and chemical properties are identical to those of mined diamonds.

Are all lab grown diamonds the same colour and clarity?

No—that is why the most reputable grading labs (ie, GIA, HRD, IGI) will also grade lab-grown diamonds for their colour, clarity and cut.

What percentage of all diamonds are lab grown?

Lab-grown diamonds only make up about 15% of all diamonds in the market. This means that they are still relatively rare within the industry.

Fun fact: Laboratory-grown diamonds were invented by General Electric in the 1950s and have been responsible for significant industrial advancements in telecommunications, optics, and healthcare.

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