What if a diamond could take carbon from the air, rather than mining the earth?
Skydiamond has been Imperial London Verified as the world's first carbon-negatve diamond. Using atmospheric carbon, rainwater and renewable energy, Skydiamond grows diamonds in its Gloucestershire Sky Lab, combining scientific innovation with British craftsmanship.
Unlike conventional production methods, Skydiamond’s process is designed to remove carbon dioxide (CO₂) from the atmosphere and retain that carbon within a diamond. An independent life-cycle assessment conducted by experts at Imperial College London found that Skydiamond’s lab-grown diamonds reduce greenhouse gas emissions by 99.79% compared with mined diamonds.
A Lab-Grown Diamond With A Different Beginning
A Skydiamond engagement ring is a symbol of commitment, created with the future in mind. Take the Elemental Collection’s Earth Ring: a considered expression of modern design, bringing together fine jewellery and a different approach to how diamonds are made.
Every Skydiamond begins with four elements: atmospheric carbon, rainwater, wind and sunlight. Rather than relying on traditional mining, Skydiamond uses patented technology to transform these natural resources into diamonds with the same essential chemical and physical properties as mined diamonds.
The result is a genuine man-made diamond, grown in a laboratory and crafted into fine jewellery. Its story, however, is different. The carbon within the stone has been captured from the atmosphere, rather than sourced through extraction.
For those choosing an engagement ring or a piece to be treasured across generations, this offers a new perspective on luxury: beauty shaped by both design and responsibility.
What Are Carbon-Negative Diamonds?
Carbon-negative diamonds are diamonds produced through a process that removes more carbon dioxide from the atmosphere than it emits across the assessed production life cycle.
The distinction matters. Carbon-neutral products generally balance their emissions against removals or other measures. Carbon-negative production goes further by achieving a net removal of greenhouse gases.
It is also important to distinguish carbon-negative diamonds from lab-grown diamonds more broadly. Lab-grown diamonds are created above ground rather than mined, but their environmental impact depends on how they are produced, including the energy sources and materials involved.
A laboratory setting alone does not make a diamond carbon-negative. The production process must account for its emissions and demonstrate a net reduction.
At Skydiamond, carbon capture is integral to the way each stone is created. Rather than relying on carbon offsetting to balance emissions, the process incorporates atmospheric carbon into the diamond itself, with renewable energy powering production.
How Skydiamond Turns Air Into Man-Made Diamonds
At the Sky Lab in Gloucestershire, science and nature come together through a carefully developed production process. Each stage contributes to the creation of a diamond, from capturing its carbon source to growing and finishing the stone.
1. Capturing carbon from the atmosphere
The process begins by extracting carbon dioxide directly from the air. The captured CO₂ is liquefied and purified before being used in diamond production.
This is the starting point for every Skydiamond: carbon that was once part of the atmosphere becomes the raw material for a lasting gemstone.
2. Using rainwater to produce hydrogen
Rainwater collected from the factory roof is split into hydrogen and oxygen through electrolysis.
The hydrogen is then used alongside the captured carbon dioxide in the next stage of the process. By using collected rainwater and renewable electricity, Skydiamond takes a different approach to sourcing the materials needed for diamond growth.
3. Creating the material needed for diamond growth
The captured CO₂ and hydrogen are combined through Skydiamond’s patented process, which uses biological single-cell life forms to produce methane. A small amount of nitrogen is also introduced.
This methane becomes the carbon-bearing feedstock used to grow the diamonds. It is a key step in turning atmospheric carbon into the material required for crystal formation.
4. Growing the diamond using renewable energy
The prepared material enters chemical vapour deposition (CVD) reactors, known at Skydiamond as its diamond mills. Inside, a plasma environment reaches approximately 1,000°C, allowing diamond crystals to grow on small diamond seeds.
The process takes several weeks. Throughout production, Skydiamond uses wind and solar energy supplied by its sister company, Ecotricity.
The result is a rough diamond grown through a controlled scientific process, ready for the next stage of its journey.
5. Cutting, grading and crafting
Once grown, the diamonds are cut and polished before being assessed for quality. Each stone is graded according to the traditional four Cs: cut, colour, clarity and carat weight.
The finished diamonds are then brought to life through jewellery design. Skydiamond pieces use reclaimed and recycled precious metals, including gold, platinum and Smart Silver, extending the considered approach beyond the stone itself.
From the first capture of carbon to the finished piece, the process brings together innovation, precision and British design.
What Does The Independent Assessment Reveal?
Sustainability claims should be supported by evidence. To assess the environmental impact of its production process, Skydiamond commissioned experts at Imperial College London to conduct an independent life-cycle assessment.
The study examined the environmental impact of diamond production and compared different production methods using a scientific framework informed by the Intergovernmental Panel on Climate Change's Sixth Assessment Report.
The findings highlight several differences between Skydiamond’s approach and conventional diamond mining.
99.79% lower greenhouse gas emissions
The assessment found that greenhouse gas emissions per carat are reduced by 99.79% compared with mined diamonds.
This finding reflects the role of atmospheric carbon capture and renewable energy in Skydiamond’s production process. Rather than treating emissions as an unavoidable consequence to be compensated for elsewhere, the process is designed around reducing its impact at the point of creation.
Carbon-negative production without offsetting
Skydiamond’s process achieves negative emissions through its combination of direct air capture, hydrogen produced using rainwater and renewable electricity.
The distinction is fundamental to the brand’s approach. Carbon negativity is built into the production method rather than achieved by purchasing carbon offsets to balance emissions generated elsewhere.
A different environmental footprint
The assessment also highlights the wider resource demands associated with mined diamonds.
Mined diamond production generates 4,383 times more waste than laboratory diamond production. Skydiamond uses a substantially lower level of water compared with mined diamonds.
These comparisons illustrate why the method of production matters. Understanding a diamond’s environmental impact requires looking beyond the finished stone to the energy, water, materials and emissions involved in creating it.
Beyond The Diamond: A More Considered Approach To Luxury
A carbon-negative diamond is one part of a wider story. How a piece is designed, the materials used to set its stone and the care taken in its manufacture all contribute to its overall impact.
At Skydiamond, every design begins with the stone. Minimalist forms, modern silhouettes and British craftsmanship allow the diamond to take centre stage, while reclaimed precious metals give existing materials a new purpose.
We also consider how resources are used throughout production. Diamond seeds are reused, off-cuts can be repurposed, and water is recirculated through closed-loop systems. Jewellery packaging incorporates recycled and upcycled materials.
These choices reflect a belief that luxury and responsibility don't need to be opposing ideas. A piece can be made to last, carry personal meaning and reflect a more considered approach to the resources used to create it.
For an engagement ring, that meaning can be especially powerful. It becomes a symbol of a relationship and a future, with a story that reaches beyond the moment it is given.
A New Way To Think About Diamonds
The future of fine jewellery should not be defined by extraction. Advances in science and manufacturing are creating new possibilities for how precious materials can be made, used and valued.
Skydiamond brings that possibility to life by capturing carbon from the atmosphere and transforming it into diamonds at its Gloucestershire Sky Lab. Supported by an independent life-cycle assessment, its process demonstrates a different approach to diamond production, with reported greenhouse gas emissions 99.79% lower per carat than mined diamonds.
A Skydiamond is more than a stone chosen for its appearance. It represents a considered choice about how beauty is created and what its creation can contribute to the world.
Luxury doesn’t have to cost the earth.
Discover the Skydiamond collections and explore fine jewellery created with purpose and precision.
