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By Tapas Koul, Head – Editorial & Strategy, Petros® Stone LLP

For decades, sustainability conversations in construction centred on operational energy: how a building performs once it's occupied. That focus is shifting upstream, to the materials themselves, what they're made of, how far they travel, and what's left behind at the point of extraction or manufacture. Procurement teams are now asking steel, cement, timber, and stone suppliers alike for something harder than a quality guarantee: documented proof of how the material was sourced.

That demand is forcing quarries, cement plants, timber mills, and fabricators to rethink processes that have gone largely unchanged for generations. “Buyers used to take our word for it. Now they want the paperwork behind the word,” says Rishabh Jain, Director at Petros® Stone LLP, one of India's top 10 stone manufacturers and exporters. The same pressure shows up across the industry, in conversations about low-carbon concrete mixes, responsibly harvested timber, and, in Petros's case, natural stone.

Materials Under New Scrutiny

Natural stone occupies an interesting position in this conversation. Unlike cement or steel, it doesn't require energy-intensive manufacturing to exist as a raw material, so the sustainability question shifts almost entirely to extraction and processing. That has made responsible quarrying, water recycling, and land reclamation the industry's proving ground. Frameworks like the Natural Stone Sustainability Standard now independently verify energy, water, and land-use practices at quarry sites.

The company's account of its export operations — supplying granite, marble, and engineered stone to markets from the Gulf to Europe — is illustrative of how these standards play out in practice: durable, low-porosity materials specified for harsh climates to minimize replacement cycles. Top 8 Quarries in India, across their granite and marble operations, have seen a considerable shift towards sustainability demands. It's a useful case study, though far from the only one — cement producers are making comparable claims about low-clinker blends, and timber suppliers about chain-of-custody certification.

Why the Small Steps Compound

The biggest misconception about sustainable construction is that it needs one breakthrough. In practice, it's smaller and less dramatic than that. Researchers studying dimension-stone quarrying recently developed optimization algorithms that reduce waste, energy, and water use together by improving how blocks are cut around a stone's natural fractures. The gain per cut is a few percentage points at most. Multiplied across years of extraction, it adds up to something real. Cement plants see the same effect from kiln efficiency tweaks, and timber operations from small improvements in yield per log.

For EPC (Engineering, Procurement & Construction) buyers, this shifts the key sourcing question. Rather than asking what a supplier achieved on a single project, ask how long they've sustained that performance and how consistently they've delivered it across multiple projects. 

Three Technologies Worth Watching

Materials science is also producing genuine breakthroughs alongside the incremental gains. Three from the past year stand out:

1. Self-healing (bio) concrete. Bacteria-induced calcite precipitation has been shown to raise concrete's compressive strength by up to 32% while cutting chloride-ion penetration by nearly half, extending structural lifespan and reducing repair-driven material waste (Pooja & Tarannum, Discover Applied Sciences, 2025).
2. Carbon-mineralized concrete. Injecting captured CO₂ during mixing or curing permanently locks it into the concrete matrix as stable carbonate while improving strength; fully scaled accelerated carbonation could sequester hundreds of millions of tonnes of CO₂ annually if adopted industry-wide (Kumar, Gunasekaran & Govindarajan, Journal of Building Engineering, 2025).
3. AI- and digital-twin-driven extraction. Machine learning models are now estimating rock parameters from live drilling data, letting quarry and mining operators adjust cutting decisions before waste occurs rather than after (Khan et al., Journal of Intelligent Construction, 2025).

These technologies don't replace the slower work of sourcing discipline. They give it more to work with.

A Closing Thought

Claims of being ‘green’ are easy to make and hard to check. What's changing is who's expected to show their work, and for how long. Stone, cement, steel, and timber suppliers are all being held to roughly the same standard now: not a single certification, but a track record. Whether that becomes the industry norm, or stays confined to a handful of exporters chasing European and Gulf contracts, is still an open question.