One question is being asked more and more often, and it is getting sharper: can a lab grown diamond really be zero impact? The honest answer is one word. No. No manufactured object is. We sell lab grown diamonds, and we think they beat the alternative on several specific points. That does not entitle us to call them eco-friendly. Here is what a piece of jewellery's footprint actually contains, item by item, without the usual marketing vocabulary.

Why the question is better framed than it used to be

Five years ago people asked us whether a lab grown diamond was a real diamond. Today they ask whether it is genuinely sustainable, whether it really reduces mining impact, and whether renewable energy changes anything.

Those are far better questions. They assume two things have been understood. That the stone is chemically identical. And that manufacturing is never free for the planet.

The problem is that the industry's language has not kept up. You still read « eco-friendly alternative », « sustainable diamond », « zero impact » everywhere. None of those phrases survives serious examination.

They do not survive French law either, which regulates environmental claims ever more strictly. A company cannot state that a product is neutral or ecological without solid, verifiable evidence. We treat that constraint as good news: it forces us to say what we know, and to stay quiet about the rest. This is a French framework, and it is stricter than what many markets currently require.

Energy: the real cost of a lab grown diamond

A lab grown diamond is not assembled, it is grown. That takes weeks, in extreme conditions, and it consumes a great deal of electricity.

Two processes coexist, and they are not equivalent.

HPHT, high pressure high temperature. It reproduces the conditions of the earth's mantle. Pressure and temperature have to be driven very high and held there. It is the more demanding process.

CVD, chemical vapour deposition. A carbon bearing gas is broken down in a chamber, and carbon deposits layer by layer onto a seed. The pressure is far lower. So is the consumption, even though the cycle stays long.

Then come the steps nobody ever counts. Cutting and polishing, often done thousands of kilometres from where the stone was grown. Post growth treatment, since many stones go through an additional HPHT step to improve their colour. Transport. Certification. And then making the piece of jewellery itself.

In other words, the stone alone does not sum up the footprint of the piece.

Why the number depends on where the stone was grown

This is the point almost no jewellery site explains, and it is the heart of the matter.

A lab grown diamond consumes electricity. The carbon footprint of that electricity depends entirely on how it was produced.

The same machine, running on a heavily carbon intensive grid or on a largely decarbonised one, does not produce anything like the same stone from a climate point of view. The process is identical. The environmental result is not.

That means three things.

A lab grown diamond has no single footprint. Talking about the number for « lab grown diamonds » makes no sense.

The relevant question is not mined versus lab grown. It is: where was this particular stone grown, and on what electricity?

And that information is rarely available. An IGI certificate attests that the stone is lab grown, states the process and describes the stone's characteristics. It does not attest to the facility's electricity mix. A seller who swears otherwise is not telling the truth.

What the comparison with mining does and does not show

Precision matters here, because figures fly in both directions and both camps have an interest in exaggerating.

What is solid, and not seriously disputed.

Mining moves enormous volumes of earth for a very small mineral yield. It permanently alters landscapes, water tables and ecosystems. An open pit does not close itself.

Growing a stone in a laboratory moves no earth at all. On that specific measure, the gap is clear and it favours the laboratory.

What is much less solid, on the other hand.

Headline comparisons in kilos of CO2 per carat. They rest on different boundaries and different assumptions, and are often published by parties with a direct interest in the answer. There is no shared standard that makes these studies comparable with each other.

And a point rarely raised: mining supports entire regions. A mass shift to laboratory production has real social consequences in some producing countries. That is not a reason to abandon lab grown stones, but it is a reason not to present the subject as a simple victory.

Our detailed comparison of the environmental impact of natural and lab grown diamonds goes through each item.

Recycled gold: what it fixes and what it does not

We work in recycled 18 carat gold. We are committed to it. And we are going to say precisely what that guarantees, because the word recycled has become a comfortable shortcut.

What recycled gold genuinely fixes. It requires no new extraction. That is the heaviest step in the gold chain, the one that mobilises enormous volumes of rock and dangerous chemicals. Avoiding it is not a marketing detail, it is the main item.

What recycled gold does not guarantee. And here, let us be very clear.

Gold is melted down. Once melted, it loses its history. A refined gold bar carries no trace of where it came from. So the word recycled describes an origin by reuse, not individual traceability. Nobody can show you the piece of jewellery your band came from.

The scope of the word also varies between operators. It can cover old jewellery bought back, workshop scrap, industrial waste or electronic waste. Those sources do not carry the same environmental benefit.

Finally, refining itself consumes energy and uses chemicals. Far less than extraction, by a wide margin, but not nothing.

So the honest phrasing is this: recycled gold avoids an extraction, it does not provide traceability. We developed that point in our article on ethical jewellery.

Jewellery and the circular economy: what is true

We are often asked whether jewellery fits into circular thinking. On that ground the answer is far more favourable, and for once it is solid.

A piece in solid precious metal lends itself particularly well to reuse. Gold does not degrade. It can be melted indefinitely without losing its properties. That is why a significant share of the gold in circulation today has already been used several times.

A piece in solid metal can also be repaired. A ring can be resized. A claw can be retipped. A band can be re-soldered. A clasp can be replaced. Thirty years later, the piece goes round again.

And the stone does not wear out. A diamond, lab grown or mined, does not scratch and does not fade. It can be unset and remounted on another setting.

That is where the real lever sits, and it is not in the stone. It is in how long the piece lasts. A piece worn for thirty years and then handed down has an annual footprint nothing like three pieces bought over ten years. Our article on upcycling old jewellery shows what that looks like in practice.

The words we refuse to use

Jewellery is not a necessity. Nobody needs it to live. That imposes a certain discipline on how you talk about it.

Here is what you will not read from us, and why.

« Eco-friendly ». A manufactured object is not. It can be lighter than another. That is not the same thing.

« Carbon neutral » or « zero impact ». That would require a full life cycle accounting we do not have, and an offset whose effectiveness is heavily debated.

« Sustainable » used on its own. The word has been stuck on so many things it no longer means anything. We prefer to say what actually lasts: the metal, the stone, the repairability.

« Traceable » for recycled gold. That is false, as explained above.

What we say instead is narrower and firmer. Our diamonds are lab grown and IGI certified. Our gold is recycled 18 carat gold, so it comes from material that was not extracted for us. Our pieces are designed to be repaired and handed down. Every one of those sentences can be checked. That is the test.

How to choose a piece knowing what you are doing

Down to specifics. Here is what you actually have control over, ranked by real effect.

Buy a piece you will wear for a long time. This is lever number one, by a wide margin. It crushes all the others. A design that looks like you will always beat a design that is in fashion.

Prefer solid metal to plating on a piece that rubs. Solid metal can be repaired and repolished indefinitely. Plating wears through and has to be redone.

Look at the carat size. A smaller stone needs less growth time. The relationship is not linear, and it is one of the few direct levers on energy.

Ask for the certificate. It says nothing about energy, but it says what the stone is. That is the baseline.

Ask about repairs before you buy. A seller who cannot tell you what happens in five years when a claw bends is not selling jewellery built to last.

Be wary of language that is too smooth. A brand that admits no limits is usually hiding several.

What to remember

A lab grown diamond is not eco-friendly. It is manufactured, so it costs energy.

On one specific measure, land use, the gap with mining is clear, and it works in favour of the laboratory. On carbon, everything depends on the electricity mix where the stone was grown, and that information is rarely accessible.

Recycled gold avoids the heaviest step in the gold chain. It does not, for all that, provide traceability, because melted metal loses its history.

The only genuinely decisive lever is time. A piece worn for thirty years, repaired once and then handed down beats any marketing argument.

That is how we work, and it is also the only thing we know how to prove. To go further, read ethical jewellery, what the word guarantees and our piece on French quality.

FAQ

Are lab grown diamonds eco-friendly?

No. They are manufactured, and growing them consumes a lot of electricity. They do avoid the earth moving involved in mining, which is a real and measurable advantage on land use. Lighter is not the same as impact free.

Can a lab grown diamond be carbon neutral?

Not strictly. A stone grown on largely decarbonised electricity will have a far smaller footprint than another, but never a zero one. Neutrality claims generally rest on offsets whose effectiveness is debated.

HPHT or CVD: which process uses less energy?

CVD works at far lower pressure and generally consumes less than HPHT. One caveat: many CVD stones then go through an HPHT treatment to improve their colour, which adds an energy intensive step that is rarely counted.

Is recycled gold traceable?

No. Gold is melted and refined, and at that point it loses all trace of its origin. The word recycled describes an origin by reuse, which avoids a new extraction, but it does not describe individual traceability.

Does an IGI certificate guarantee the environmental impact of the stone?

No. An IGI certificate attests that the stone is lab grown, states the process and describes its characteristics. It says nothing about the facility's electricity mix or the carbon footprint of the growth.

Do lab grown diamonds actually reduce mining?

Demand is shifting, certainly. But mining does not stop as a result, and that shift has real social consequences in regions that live off the mine. The subject deserves better than a one word answer.

What single action most reduces a piece of jewellery's footprint?

Wearing it for a long time. A piece kept for thirty years, repaired and then handed down has an annual footprint nothing like several pieces bought and abandoned. It is the one lever that crushes all the others.

Why does Lauredi not describe its jewellery as eco-friendly?

Because it would be untrue, and because French law strictly regulates that kind of claim. We prefer to state what we can prove: IGI certified lab grown diamonds, recycled 18 carat gold, and pieces designed to be repaired and handed down.

Fiona