Why 90% of the World's Diamonds Are Cut and Polished in Surat

Ask any diamantaire where the world's diamonds are actually cut and the answer is almost always the same: Surat. A single city on the western coast of Gujarat, India, is responsible for cutting and polishing an estimated 90% of the world's diamonds by volume. For international buyers, that concentration isn't a curiosity — it's the single most important fact in the entire supply chain.

The scale is hard to overstate

At its peak, Surat's diamond industry has generated more than $24 billion in annual turnover, running through more than 6,000 polishing units and employing upwards of 700,000 skilled workers. Rough stones arrive from mines in Africa, Russia, Canada, and Australia, and a large share of them pass through Surat before they ever reach a retail counter anywhere in the world.

This isn't a boutique cluster of a few large factories. It's a dense, specialized ecosystem: cleaving, cutting, polishing, grading, and finishing are often split across different specialist units, each competing on precision and yield. That density is exactly why costs stay competitive and why quality has climbed steadily over the past two decades — competition inside one city, at a scale no other cutting center can match.

Why other centers can't easily compete

Antwerp, Tel Aviv, and Hong Kong remain critical trading and distribution hubs — and they matter enormously for certification, finance, and secondary trading. But manufacturing scale is different from trading scale. Labor specialization built up over generations, machinery investment, and sheer throughput capacity mean that shifting large-scale cutting and polishing elsewhere would take decades, not years. Surat's advantage compounds: more volume brings more specialized labor, which brings more precision, which brings more volume.

What this means for buyers

If nearly every diamond a buyer will ever purchase has passed through Surat at some stage, the practical question becomes: why buy several links down the chain instead of at the source? Each intermediary step — trader, cutter's agent, wholesaler, importer — adds a margin and a layer of distance from the actual manufacturing floor. Buyers who source directly in Surat aren't chasing a novelty; they're removing avoidable cost and getting closer to verifiable origin.

That's the gap Surat Diamond Bourse was built to close — a single, secure, purpose-built trading complex that puts direct manufacturers and international buyers in the same room. We cover exactly how that visit works in our buyer journey walkthrough.

The takeaway

Surat isn't one option among many for diamond sourcing — for the vast majority of stones in global circulation, it's the origin point. Understanding that concentration is the first step for any buyer serious about improving margin, traceability, and long-term supply reliability.