Lab-grown diamonds are reshaping jewellery chiefly by making diamond stones cheaper and intensifying competition with mined diamonds. The environmental effect is less clear: a lab-grown diamond’s carbon footprint depends on how and where it is made and what powers the factory. Without supplier-specific production and electricity data, a lower footprint cannot be assumed.
How large is the lab-grown diamond market?
Market figures describe different things, so they should not be added together or treated as interchangeable. Some count jewellery sales, others estimate a broader market value, and a market share is not the same measure as revenue.
| Measure | Reported figure | Scope and status |
|---|---|---|
| Global lab-grown diamond jewellery sales | Nearly USD 9 billion in 2024 | Euromonitor International’s February 2025 estimate; jewellery sales, not all synthetic-diamond applications. Euromonitor also estimated the United States accounted for 70 percent of global lab-grown diamond jewellery sales in 2024. |
| Share of global diamond jewellery sales | Nearly 20 percent | McKinsey & Company and Business of Fashion’s State of Fashion 2026, published in 2025, reported this share. The report said it could reach 50 percent by 2030; that is a forecast, not an observed result. |
| Separate market-value estimate | USD 3.60 billion for 2025; USD 4.59 billion projected for 2035 | Douglas Insights’ September 2026 commercial estimate. Its stated scope excludes natural diamonds and industrial diamond grit and powder. Its market definition and method differ from Euromonitor’s jewellery-sales measure. |
These measures do not establish a single, definitive market size. They do show why a headline about rapid growth needs context: Euromonitor said jewellery-sales growth had begun to slow after a period of rapid expansion, while McKinsey and Business of Fashion’s 2030 share is a projection.
Why do lab-grown diamonds keep getting cheaper?
They are manufactured rather than mined, and expanding production has increased competition. The clearest price evidence in the available figures is a like-for-like comparison in one defined quality segment—not a price rule for every stone.
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| Price measure | Comparison reported | What it applies to |
|---|---|---|
| Wholesale | In 2025, 5 percent of the 2018 level | Natural Diamond Council’s 2025 release, citing wholesale analyst Edahn Golan, for a 1-carat round lab-grown stone in FGH colour and VS1 clarity. |
| Retail | In 2025, 24 percent of the 2018 level | The same specified 1-carat, round, FGH, VS1 lab-grown segment; the release attributes the retail data to analyst Paul Zimnisky. |
The wholesale and retail comparisons are not interchangeable: retailers’ prices also reflect the route to market and selling costs. Nor do these percentages say what a particular ring costs today. Cut quality, grading, seller, setting and market all matter, and the reported comparison should not be generalized to different carat weights or grades.
What recent price signals do—and do not—show
UNI Diamonds reported that its Lab-Grown Diamond Index fell 6.28 percent in Q2 2026, following a 9.3 percent decline in Q1 2026. In Q2 2026, UNI reported declines of 7.68 percent for round stones and 5.67 percent for fancy shapes. These are movements in one publisher’s index, not a universal price measure, and they should not be combined directly with the Natural Diamond Council’s 2018-to-2025 comparison.
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For household finances, the practical implication is that a lower purchase price can make a larger or higher-graded stone attainable within a fixed budget, but it does not make the stone a reliable store of value. The cited price declines are evidence of falling prices, not evidence of future resale proceeds. No resale value for a specific stone follows from these market figures.
What is driving the market shift?
Price is a major part of the appeal, while a broader range of products may support demand. McKinsey and Business of Fashion reported that half of U.S. lab-grown diamond sales come from bridal jewellery. Its report also identified coloured stones and broader jewellery collections as possible opportunities for brands. These observations describe the U.S. sales mix and potential avenues for companies; they do not guarantee continued growth.
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Lower prices can also create pressure for sellers. Euromonitor identified intensifying competition, market saturation, sustainability scrutiny, tighter labelling and marketing regulation, and the risk that continued price declines weaken perceived value among the challenges facing the category. A larger share of unit sales therefore does not automatically mean rising revenue, stronger margins or stable prices.
How are lab-grown diamonds made?
The Gemological Institute of America identifies two principal growth methods: high-pressure, high-temperature (HPHT) and chemical vapour deposition (CVD). Both produce diamond material, but they use different processes and operating conditions.
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HPHT
HPHT uses a press, a diamond seed and a carbon source under high pressure and temperature. Its energy and emissions depend on production details, including the equipment and electricity supply.
CVD
CVD grows diamond material in a chamber from a carbon-bearing gas. The process can be energy-intensive, and its emissions depend in part on the electricity used. Neither method by itself establishes whether a particular stone has a lower carbon footprint than a mined diamond.
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Do lab-grown diamonds cut the carbon footprint?
Not necessarily. There is no single agreed carbon-footprint figure for all lab-grown diamonds. Results vary with growth method, factory, production location, electricity mix, productivity and assessment methodology. A footprint figure is useful only when its assumptions and boundaries are clear.
| Reported estimate | Production context | Important qualification |
|---|---|---|
| 260–612 kg CO2e per polished carat | CVD production in India | Estimates relayed by the Natural Diamond Council’s 2024 annual-report discussion, published in a 2025 report and attributed to Sphera research. The range reflects specified production assumptions, not a global average. |
| As low as 17 kg CO2e per polished carat | A scenario using 100-percent renewable electricity | Also relayed by the Natural Diamond Council from Sphera estimates. It is a scenario, not a claim about typical factory electricity or every lab-grown stone. |
These estimates are not a direct, like-for-like comparison with a specified mined diamond. The Natural Diamond Council is an industry organization, and its report’s synthesis should be read with that attribution in mind. A separate 2021 peer-reviewed study compared energy and water consumption for mined and synthetic diamonds and reported method-dependent energy needs and low water intake for HPHT and CVD in its study. Its technologies, inputs and boundaries limit how broadly its findings can be applied. Neither source supports a blanket claim that every lab-grown stone is lower-carbon than every mined stone.
What to ask before accepting an environmental claim
- Growth method and location: Is the stone HPHT or CVD, and where was it produced?
- Electricity evidence: Does the supplier provide metered or allocated electricity use and verifiable evidence for any renewable-energy claim?
- Yield assumptions: Does the footprint calculation account for production yield and rejected material?
- Accounting boundary: Does the figure cover operational electricity alone or broader lifecycle impacts, and is it stated per polished carat?
- Comparable product: If the claim compares a lab-grown and mined stone, are the stones and assessment boundaries sufficiently alike for the comparison to be meaningful?
If a seller does not disclose these details, the footprint cannot be established from the available information. A general label such as “sustainable” is not a substitute for production-specific evidence.
What should a buyer compare before spending?
A lower sticker price is only one part of a diamond purchase. Compare stones on the same basis and assess the seller as well as the stone.
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- Match carat weight, cut, colour and clarity before comparing prices.
- Check the grading report and who issued it; do not treat a marketing description as a grading document.
- Ask whether the stone is HPHT or CVD if the growth method matters to you.
- Review the seller’s identity, return terms and any disclosed setting or service costs.
- Evaluate carbon claims using the production, electricity and accounting details above.
- Treat future resale claims cautiously unless they are supported by evidence specific to the seller, stone and transaction terms.
For budget planning, decide the maximum amount you are willing to spend before comparing stones. Lab-grown options may provide more choice at a given budget, but the documented fall in prices also means today’s price should not be read as a promise of future value.
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