Ten years ago, sustainability was a peripheral concern in stone. Today, it is the first question serious specifiers ask — and rightly so. Quarrying, cutting, polishing and shipping stone is energy-intensive, water-intensive, and often opaque about labour practices in the supply chain. This piece is an honest look at what the industry has been doing about it, what Oreana has been doing, and what specifiers should ask before they sign an order.
The environmental footprint of a slab
A finished 20 mm marble slab weighs roughly 200 kg. Producing it requires: extracting several times that weight of raw block from a quarry (60–75% of quarried stone becomes waste); trucking the block to a processing plant; slicing the block with gang-saws or diamond wire; polishing the surface with progressively finer diamond wheels; and finally packaging and shipping the slab. Each stage consumes energy — around 4.2 kWh per m² for engineered quartz, higher for polished natural stone with long transport distances.
Water use is significant: gang-saws and polishing lines use large volumes of process water to cool tools and remove slurry. A well-designed factory recycles this water in a closed loop; a poorly-designed one discharges it to the environment along with heavy-metal-contaminated slurry.
Three questions to ask any supplier
1 · Where does the raw material come from?
Ask for named quarries and copies of quarry-lease documents. A supplier who cannot tell you the quarry — or worse, who obscures it — is not one you should build a long-term relationship with. Reputable stone brands publish annual sourcing reports; the leaders publish audit records and welcome third-party inspection.
2 · What is the water and waste practice?
A responsible factory will show you (or at least describe on request): a closed-loop water recycling system, an on-site slurry press that dewaters the waste, and a documented plan for the dry waste (ideally reprocessed into terrazzo, road-base or agricultural lime; at worst, sent to a licensed landfill, never dumped in surface water).
3 · What is the energy mix?
Grid electricity in India is currently around 55% coal-derived. A factory that has moved to on-site solar, wind PPA or biomass has meaningfully lower embodied carbon per slab. Ask for the current renewable percentage and the roadmap to 100%.
Ethics in stone is not a marketing claim — it is a documented supply chain. Anyone who cannot document it is guessing at best and hiding something at worst.
What Oreana has been doing
Since 2019, Oreana has been ISO 14001 certified — the international standard for environmental management. In practice this means: quarry sourcing is documented at slab level; process water is recycled in a closed loop with 96% recovery; slurry is dewatered and reprocessed into terrazzo aggregate; off-cuts are graded and returned to production, or crushed into road-base sold to Gujarat state highway projects.
In 2023 we commissioned a 1.4 MW rooftop solar plant that now powers approximately 40% of daily operations. Our roadmap targets 100% renewable by 2028, funded from a small capex allocation on every profitable quarter. We publish annual sourcing and environmental reports on request to any serious enquiry.
What responsible specifying looks like
Prefer domestic to imported, unless there is a specific reason not to
Shipping stone across oceans is carbon-heavy. Choosing a domestic source (or an in-country processor of imported blocks) typically halves the transport footprint. India, Italy, Turkey and Brazil all have deep stone traditions and can supply excellent material without long-haul shipping. If your project needs a specific look that only comes from a distant source, make it a conscious choice.
Right-size the slabs
A cleverly-designed job that uses standard slab sizes wastes far less material than one that requires custom cuts from oversized blocks. Talk to your fabricator early; a good one will show you how to save 15–20% of material with minor design adjustments.
Consider recycled or reprocessed alternatives
Terrazzo made from stone off-cuts is one of the highest-carbon-efficiency surfaces available and is beautiful in its own right. Modern terrazzo comes in refined finishes that rival high-end natural stone at a fraction of the embodied energy.
Choose engineered surfaces from transparent manufacturers
Engineered quartz has a higher initial energy cost than raw marble, but eliminates ongoing sealing and — because slab-to-slab consistency reduces waste-cuts — often has lower material waste over a project. The important question is which manufacturer you are supporting: one with published sustainability practice, or one with none.
The direction of travel
The best stone companies are moving in the same direction as the best textile, timber and food producers: full traceability, published environmental accounts, third-party audits, and a real commitment to reducing footprint over time. The industry laggards are moving nowhere, and their prices reflect the choice.
Specifiers can accelerate this shift by asking the three questions above, by weighting sustainability meaningfully in tenders, and by publicly celebrating the suppliers who deliver on documented practice. The stone in your building will outlive its designer, its owner and often its city. It deserves better than a short-term relationship with the cheapest available source.