Indian Sandstone: What to Ask Before You Buy
If you are buying paving in the UK or Ireland, there is a strong chance you are looking at Indian sandstone. It is the most widely used imported natural paving material in the British market — approximately 250,000 tonnes are shipped from Rajasthan to the UK each year, finishing up in driveways, patios, and pavements across the country.
It is also a stone whose supply chain has documented problems. Child labour, debt bondage, silicosis among quarry workers, opaque sub-contracting, and unregistered mines are all features of the Indian sandstone industry that have been investigated and reported on by trade journalism, NGOs, and the UK trade body itself for more than a decade.
This is not a guide telling you to avoid Indian sandstone. The Indian sandstone trade supports the livelihoods of tens of thousands of workers and represents enormous skill and tradition. The right response is not boycott but informed buying: knowing which questions to ask your supplier, understanding what good answers look like, and knowing what alternatives exist if you decide to source elsewhere.
found.rocks does not sell stone, does not take commission on supplier sales, and is not affiliated with any importer. This is an independent reference written for buyers.
What Indian sandstone actually is
Indian sandstone is the trade-name for sedimentary sandstone quarried predominantly in the Indian state of Rajasthan, with major production centres at Jodhpur, Kota, and Bundi. Rajasthan is the largest producer of sandstone in India and the most significant single source of imported paving stone in the UK and Irish markets.
The stone itself is a high-quality material. It is available in a wide range of natural colours — buff, grey, raj green, modak, autumn brown, mint, kandla grey, and many others — and at price points significantly below comparable UK-quarried sandstone. Good Indian sandstone is durable, attractive, and entirely competent for paving and walling applications.
The stone is not the issue. The conditions under which some of it is produced are.
The honest picture of the industry
The Rajasthan sandstone industry has been the subject of extended investigation by NGOs, the UK Ethical Trading Initiative, the International Bar Association, and labour-rights researchers. The picture is not uniform — conditions vary substantially between quarries, and meaningful reform efforts exist — but the documented issues include:
Child labour
UNICEF has estimated that approximately 20% of workers in a typical Indian quarry are children. Some are bonded to gangmasters, working to pay off family debts inherited from earlier generations. Children begin working in the mines as young as 10 years old, earning roughly £1 per day, and are exposed to the same dust, heat, and physical hazards as adult workers.
Reform efforts — particularly those led by the Ethical Trading Initiative working with UK importers — have made measurable progress in specific supply chains, but the problem is not solved at industry scale.
Silicosis among quarry workers
The greater long-term human cost is silicosis, an incurable lung disease caused by long-term inhalation of crystalline silica dust generated by mining and processing sandstone. Approximately half of Rajasthan’s two million stone-mine workers are estimated to suffer from silicosis or other respiratory diseases.
Public registration data illustrates the scale: between 2018 and early 2023, the Rajasthan state government’s silicosis grant disbursement portal registered 48,448 cases of silicosis across the state, of which 31,869 were certified for compensation — and these figures cover only diagnosed cases that reached the state scheme. Silicosis is preventable with basic dust suppression, ventilation, and respiratory protection. Many smaller and unregistered quarries do not provide them.
Opaque supply chains and unregistered mines
The Indian sandstone supply chain typically passes through multiple intermediaries between quarry and export — mine owner, processor, finishing yard, exporter, importer. Many mines are unregistered or unlicensed, which means buyers two or three steps down the chain (UK importers, distributors, garden centres) often cannot trace the actual quarry of origin for any given consignment.
This is the structural problem the certification schemes below try to address.
Why this matters
The Modern Slavery Act 2015, which requires UK businesses with turnover above £36 million to publish supply-chain transparency statements, applies to companies importing Indian sandstone among everything else. But the Act does not require small importers to publish — and most stone businesses fall below the threshold. The result is that legal compliance does not by itself protect a buyer from inadvertently buying stone produced in conditions that the buyer would not consent to if they knew about them.
What’s been built to address it
The Indian sandstone industry has not been ignored. Several mechanisms exist that a responsible buyer can use, both to inform their own decisions and to specify against.
The Ethical Stone Register
The UK natural stone industry’s principal mechanism is the Ethical Stone Register, run by Stone Federation Great Britain. Suppliers on the register have completed a structured questionnaire about their supply-chain due-diligence and met its criteria; some have additionally had their submissions independently verified by a third-party auditor.
For Indian sandstone specifically, ESR membership tells a buyer that the supplier has documented their supply-chain due-diligence under the register’s framework — the register is the strongest published industry-led signal available in the UK trade. We’ve covered the register in detail in What is the Ethical Stone Register, and Why It Matters.
The Ethical Trading Initiative
The Ethical Trading Initiative (ETI) is a UK-based alliance of companies, trade unions, and NGOs working on labour rights in international supply chains. ETI’s stone working group has worked directly with Indian sandstone processing yards to implement HR policies and labour standards. UK importer members include Marshalls (a longstanding leader on this), London Stone, and Natural Paving among others.
For a buyer, ETI membership of an importer signals that the company has a structured engagement with labour-rights issues in its supply chain — separate to and complementary with ESR membership.
XertifiX
XertifiX is a German non-profit certification scheme that audits stone production sites in India, China, and Vietnam against ILO (International Labour Organization) labour standards. XertifiX certifies stone batches at the request of importers. The scheme is more common in continental European supply chains than in the UK, but XertifiX-certified Indian sandstone is available through some UK importers and is a meaningful third-party signal.
Importer-led programmes
Some UK importers run their own ethical-sourcing programmes — direct relationships with specific Rajasthan quarries, on-the-ground audits, child-labour-free guarantees, and workforce welfare initiatives. Marshalls has been particularly visible on this; London Stone publishes its ethical sourcing approach in detail. Where an importer has an own-brand ethical-sourcing programme, ask them to send you the documentation. The serious ones publish it because they want it to be read.
What to actually ask your supplier
For any meaningful purchase of Indian sandstone, here is what to put to your supplier directly. A reputable supplier will be able to answer the first three immediately.
1. Are you on the Ethical Stone Register?
Yes/no. If yes, is the membership independently verified or self-declared? You can verify the answer at ethicalstoneregister.co.uk.
2. Are you (or is your importer) a member of the Ethical Trading Initiative?
Particularly relevant for larger suppliers and the major UK importers. ETI membership is published.
3. Can you tell me which quarry the stone is from, and whether the quarry is registered with the Rajasthan state authorities?
This is the key supply-chain transparency question. A serious supplier should know — at least to the level of which quarry-cluster and which processing yard. “We can’t tell you” is itself a meaningful answer.
4. Is the stone XertifiX-certified, or has it passed an equivalent third-party audit?
If yes, ask to see the certificate or audit reference. If no, ask what alternative due-diligence the supplier has applied.
5. What is your supplier’s policy on child labour, and how is it monitored?
Ethical Trading Initiative member importers will have a documented policy and a published monitoring approach. Any supplier should be able to articulate one.
6. What workplace silica-dust controls are in place at the production sites you buy from?
This is the silicosis question. The serious answer involves wet cutting, ventilation, respiratory protection, regular health screening of workers, and access to compensation if silicosis is diagnosed. Vague reassurance is not the same as documented practice.
7. Where else do you source from?
A supplier who imports from a single unverifiable source is taking on more risk than one with multiple audited sources. The answer also tells you what alternatives the supplier could offer if you decide to specify away from Indian sandstone for this project.
What good answers look like
You do not need to ask all seven questions to make a sensible decision — though for any large or specified project they are all reasonable. What you are listening for in the answers is:
- Specificity over vagueness. “We import from registered quarries in the Jodhpur district and our processing partner is XYZ; we audit annually” is meaningful. “All our suppliers are reputable” is not.
- Documentation over reassurance. A supplier who can email you their ESR certificate, ETI membership confirmation, or XertifiX paperwork is in a different category from one who cannot.
- Acknowledgement of the issues over denial. The Indian sandstone industry has documented issues. A supplier who acknowledges them and tells you what they do about them is more credible than one who claims they don’t exist.
- Willingness to be checked. Anything a serious supplier tells you about ESR or ETI membership can be cross-checked against the published register or the ETI member directory. They know that. They expect you to. The ones who tell you not to bother are the ones to be cautious of.
What if you decide against Indian sandstone
The right response to provenance concerns is not always to switch material. For many projects — particularly large paving schemes where Indian sandstone has a meaningful cost advantage and the supplier offers genuine due-diligence — buying Indian sandstone responsibly is the right call. The certifications and questions above exist to make that possible.
But for some projects, you may decide that the simpler option is to specify a stone whose supply chain is entirely UK or Ireland based. Reasonable alternatives include:
For warm buff paving where Indian sandstone would be the default:
- Yorkstone — buff Carboniferous sandstone from West and South Yorkshire. More expensive than Indian sandstone but the most direct UK equivalent for warm-toned paving with documented native provenance. The honest comparison: significantly higher cost per square metre, but a fully traceable supply chain.
For grey or blue-grey paving:
- Caithness Stone from northern Scotland — a hard, flat-cleaving paving flagstone with a long native tradition.
- Irish bluestone / Kilkenny Blue Limestone for premium darker tones (though this is a higher price tier than typical paving Indian sandstone).
For garden walling stone:
- Cotswold Stone — Jurassic limestone from the Cotswold belt.
- Donegal Quartzite — for irregular rubble walling in west-of-Ireland vernacular style.
For more on the Indian sandstone vs Irish stone trade-off, the existing Indian Sandstone vs Irish Limestone article covers the practical comparison in detail.
The honest framing: native UK and Irish stones are typically more expensive per square metre than Indian sandstone — sometimes substantially so. The price difference reflects working conditions, regulation, transport distance, and the different scale of the production industries. For a buyer for whom provenance is the dominant concern, that price difference is what buying provenance costs.
Common questions
Is Indian sandstone bad? No. Indian sandstone is a high-quality natural stone produced by an industry that supports tens of thousands of livelihoods. Some of it is produced in good conditions; some is produced in poor conditions. The buyer’s task is to source from the former, using the certifications and questions above. Boycotting Indian sandstone wholesale removes pressure for reform without helping the workers who depend on the trade.
Is “ethical Indian sandstone” really a thing? Yes. ESR-member importers, ETI-engaged suppliers, and XertifiX-certified production exist and serve a real market. The challenge is that it is not the default — buyers have to ask for it and verify it. Default Indian sandstone purchased on price alone, from an importer with no published due-diligence, carries materially higher provenance risk.
Does the Modern Slavery Act 2015 require importers to publish their stone supply chains? Only for businesses with turnover above £36 million. Most stone businesses in the UK and Ireland are below that threshold and have no legal reporting obligation. The Ethical Stone Register, ETI membership, and XertifiX certification are voluntary mechanisms that exist precisely because the legal floor leaves most of the trade uncovered.
What about stone from China or Vietnam? Many of the same issues apply — opaque supply chains, sometimes-poor labour conditions, dust-related occupational disease — and the same broad set of certification mechanisms (XertifiX in particular operates in India, China, and Vietnam) provide partial coverage. The questions in this guide apply equally to imported Chinese and Vietnamese natural stone.
Where can I check if a UK importer is on the Ethical Stone Register? At ethicalstoneregister.co.uk. The site has a searchable directory of current members.
Where can I check if a UK importer is an ETI member? The Ethical Trading Initiative publishes its corporate member list at ethicaltrade.org. Marshalls, London Stone, and Natural Paving are among published stone-industry members.
Where do I find a verified supplier in the directory? The found.rocks directory marks listings with a Verified badge when the business appears on a recognised certifying body’s published member list. The verification policy page explains the criteria. For specifically Ethical Stone Register membership, follow through to the supplier’s individual page or check the ESR directly — we surface verification, not the underlying detail.
A final note
Indian sandstone is a beautiful, capable, and often the right material for the project. The choice to buy it responsibly is a buyer’s choice, made one supplier at a time. Each individual project’s specification matters, in aggregate, more than the headline question of whether to use Indian sandstone at all.
A buyer who specifies Ethical Stone Register membership in their tender shifts the burden onto the supply chain to provide it. A buyer who asks the seven questions above and pays attention to the quality of the answers exerts real, useful pressure on the trade. A buyer who switches to a fully-traceable native UK or Irish stone makes a different but equally legitimate choice.
What does not work — for the Indian workers whose livelihoods depend on the trade, or for the buyers who want their projects built ethically — is buying on price alone with no questions asked. The certifications and the questions exist to make a better default available. They have to be used.
For more on certifying-body membership and how found.rocks treats it in the directory, see How verification works. For the underlying mechanism, What is the Ethical Stone Register, and Why It Matters.
References and further reading
- Stone Specialist — Guide on the Ethical Sourcing of Indian Sandstone
- Ethical Trading Initiative — Marshalls: tackling child labour in India
- Ethical Trading Initiative — Rajasthan Sandstone Ethical Sourcing Guide (PDF)
- International Bar Association — Modern slavery: importation of Indian sandstone marred by rights abuses
- Corporate Accountability Research — Rajasthan stone quarries (Report XI)
- IndiaSpend — The Price of Stone: Children at Risk of Silicosis in Rajasthan’s Quarries
- PLOS One — Silico-tuberculosis, silicosis and other respiratory morbidities among sandstone mine workers in Rajasthan
- XertifiX — Terms of reference (English)
- Ethical Stone Register — official site
- UK Government — Modern Slavery Act 2015