Africa Is Processing More Diamonds and Earning Less Per Carat

Angola’s domestic diamond processing industry grew 126.5% by volume in 2025, and a sixth cutting plant opened in August 2026. Yet the country’s average price per carat fell 29% over the same stretch.

That combination is not a contradiction. It is the central problem facing every African producer trying to capture more value from the stones it digs up.

African diamond-producing nations have chased beneficiation strategies for decades. The logic is simple: process rough diamonds at home, and you keep more of the supply chain value before the stones leave the continent. Angola, Botswana, Namibia, and South Africa have each built their own version of this policy.

The market in 2025 and 2026 is stress-testing those strategies under punishing conditions. Polished demand remains soft, India still handles roughly 90% of the world’s cutting and polishing, and the economic case for domestic processing has rarely looked harder to make.

This piece maps where value is and is not being captured across the African diamond supply chain, why India’s advantage is structural rather than merely historical, and which conditions would need to shift before domestic processing becomes a durable competitive proposition. Investors with exposure to African mining assets need this framing to judge whether beneficiation policy is a real value driver or a political liability.

Angola’s numbers tell two stories at once

Start with the good news, because there is genuine momentum here. Angola exported 23,300 carats of polished diamonds worth $109.7 million in 2025, growth of 126.5% by volume and 107% by value year-on-year. Domestic factories bought 62,500 carats of rough for processing, up 67.6% on 2024.

The physical build-out matches the export data. India’s Diarough opened a plant at the Saurimo Diamond Development Hub in August 2026, taking the site to six cutting and polishing facilities, and the government announced a seventh in September 2026.

Angola’s polished diamond exports grew 126.5% by volume in 2025, the clearest single indicator that its processing expansion is producing real throughput.

Then the pricing data arrives, and it changes the picture. Angola’s rough exports jumped roughly 70% to 17.7 million carats in 2025, worth about $1.6 billion, but the average price per carat fell 29% to $102. The Kimberley Process records total 2025 production of 15.2 million carats valued near $1.81 billion, or $119.22 per carat.

Rapaport’s 2025 Angola production data, citing the Ministry of Mineral Resources, Petroleum and Gas directly, records total production of 15.2 million carats and rough exports of 17 million carats valued at approximately $1.6 billion, giving the per-carat decline its official grounding.

Here is where the two stories collide:

• Polished exports: 23,300 carats, $109.7 million, up 126.5% by volume
• Rough exports: 17.7 million carats, roughly $1.6 billion, averaging $102 per carat
• Average price per carat: down 29% in 2025
• Forward target: 16.2 million carats at $150 per carat in 2026

The decline in per-carat realisation reflects a shift toward smaller, lower-value stones. Ecofin Agency describes the approach as betting on more diamonds even as Botswana cuts supply to defend prices.

That is the strategic bet in a sentence. The volume-first push accelerating throughput is precisely the strategy that creates the worst conditions for high-cost domestic processing, because smaller, cheaper stones are exactly where India’s cost advantage bites hardest.

What this tells you as an investor is that Angola is building processing capacity into a product-mix headwind. Capacity growth and margin growth are not the same thing, and the 2025 data has not resolved which one Angola is actually producing. The hub model’s economics rest on whether Angola can steer its rough supply toward higher-value stones over time. That question remains open.

Endiama’s production strategy, specifically its decisions around which kimberlite pipes to develop and at what extraction rate, directly shapes the rough assortment that Saurimo’s cutting plants will receive, making upstream mine planning inseparable from the downstream processing economics discussed here.

Why India’s 90% share is a structural wall, not a historical accident

Every African beneficiation policy has to contend with one fact: India handles roughly 90% of global diamond cutting and polishing. That share is not the residue of an old head start. It rests on four interlocking foundations that analysts at Bain & Company and McKinsey consistently identify.

The midstream margin squeeze that cutting and polishing operations face is not incidental to Angola’s story; it is the structural context in which every new plant at Saurimo opens, and it explains why throughput volume and profit are moving in different directions.

1. Labour cost combined with skill density. Surat pairs low relative wages with a very large, highly specialised workforce that has decades of tacit knowledge in sawing, planning, and polishing small stones at high speed with minimal wastage.
2. The cluster ecosystem. Gujarat concentrates tooling suppliers, diamond-planning software firms, financiers, certification laboratories, brokers, and training institutes within close reach, which cuts transaction costs and speeds the adoption of new techniques.
3. Financial and trading infrastructure. Specialist lenders understand diamond risk, and the Bharat Diamond Bourse in Mumbai connects polishers directly to global buyers, letting Indian firms operate on margins that would sink competitors elsewhere.
4. Policy support. Special Economic Zones, duty exemptions on imported rough, and export promotion schemes lower input costs and administrative friction.

Notice what happens when you read those four together. Labour cost alone does not explain India’s dominance; it is one strand in a dense web. An African producer competing on wages while ignoring the ecosystem is addressing a single driver out of four.

That is the essential stress test for any African processing initiative. Does the proposed hub sit alongside co-located financing, tooling, certification, and training, or is it a factory standing in isolation? The distinction separates a genuine ecosystem play from an expensive building.

The Canadian comparison as a stress test

Consider Canada’s Northwest Territories. The jurisdiction introduced local sorting and cutting requirements, yet most stones still travelled to India for polishing because of cost.

Canada is a high-income producer with strong institutions, reliable infrastructure, and stable governance. It could not overcome India’s cost advantage at scale even with those resources behind it.

The implication is sobering for African producers. If a wealthy, well-governed jurisdiction could not solve the problem with tools most African producers do not possess, the challenge facing Angola, Botswana, Namibia, and South Africa is proportionally steeper.

The African policy record: four experiments, one recurring lesson

Four African producers have run four different beneficiation experiments. Reading them side by side is the fastest way to see what the current cycle is likely to produce under pressure.

Botswana, the leading African example cited by Bain, De Beers, and the World Bank, moved sorting and some cutting to Gaborone through the Diamond Trading Company Botswana. Its factories survive largely because they receive a curated, higher-value assortment from De Beers, but multiple plants closed or downsized after the 2008 and 2015 downturns.

Namibia reserves 15-20% of production for licensed local processors, and in 2025 the Namibia Diamond Trading Company reported that 88% of carats sold to licensed processors were handled domestically. Yet the country has never built a broad ecosystem, relies on a small number of firms, and has seen episodic closures.

South Africa’s State Diamond Trader may hold up to 10% of national output and requires buyers to process at least 80% of what they acquire from it. During downturns, placing those goods profitably has proven persistently difficult.

South Africa’s State Diamond Trader has struggled to place its permitted goods profitably during downturns, the starkest illustration of how a mandate collides with market reality.

Read the four cases together and one lesson keeps surfacing. Quotas and mandates generate activity, but not resilience, because they do not create the cluster depth or specialised finance that makes processing self-sustaining.

Angola’s version carries a specific twist. Its hub leans on foreign firms, including India’s Diarough and Belgian cutting houses, which means ownership structures and dividend flows may route a substantial share of value back to foreign headquarters.

For investors, the takeaway is blunt. A beneficiation announcement is not a proxy for a competitive processing industry, and downturn resilience, not headline capacity, is the metric that separates viable hubs from policy-driven plants. Watch plant utilisation rates, profit repatriation ratios, and the quality assortment of rough.

What beneficiation actually means in the diamond supply chain

Step back from the country cases and look at the chain itself, because that is where the value question becomes concrete. Beneficiation is the process of turning a raw commodity into a higher-value product closer to where it is produced. For resource-rich nations, it is a central policy objective: keep more of the economic value at home rather than exporting it in raw form.

A diamond passes through many hands between the mine and the display case. The stages run roughly like this:

• Rough extraction at the mine
• Sorting and valuation
• Cutting and polishing
• Grading and certification
• Trading
• Jewellery manufacturing
• Retail sale

Value is added at every step, but it is not distributed evenly. The De Beers and DTCB arrangement in Botswana shows what moving one early stage, sorting, into a producing country looks like in practice.

Cutting and polishing sits in the middle of this chain. The margin available there depends on stone quality, processing efficiency, and access to buyers, which makes it neither the richest nor the poorest link. It is simply the one most fiercely contested between producing nations and established centres like Surat.

Where the real margin lives

The margin picture changes sharply further downstream. Analysis associated with Bain and McKinsey finds that value capture rises significantly when producers move into jewellery manufacturing and branding rather than stopping at cutting and polishing.

Traceability matters here too. Mine-to-market provenance programmes, already emerging in Botswana and Namibia, let producers certify origin and ethical sourcing, which can command a premium at the retail end.

Ethical sourcing premiums are among the few demand-side variables that could structurally improve African processing economics, because traceability programmes let producing countries certify origin and ESG credentials at a point in the supply chain where India’s cost advantage is less relevant than provenance.

The strategic horizon, then, is not simply whether to cut stones at home. It is whether the cutting stage becomes a stepping stone toward branded jewellery or remains an endpoint in itself. Readers who grasp that cutting is a thin-margin, volume-sensitive middle stage will immediately see why Angola’s volume-first strategy is economically precarious.

What would actually close the gap, and for whom

So what would give African domestic processing a realistic shot at being durable rather than dependent on permanent subsidy? The analytical literature keeps pointing to the same conditions.

• High-value stone focus, where labour cost is a smaller share of total value and India’s edge shrinks
• Traceability and ESG branding that command premiums in Western luxury markets
• Integrated jewellery manufacturing rather than stopping at polished stones
• Stable, curated long-term rough supply, modelled on the Botswana DTCB approach
• Cluster development with financing, certification, and tooling, not isolated factories

World Bank and African Development Bank analyses conclude that local processing mandates succeed only where a country possesses genuine cost or logistical advantages; otherwise they tend to leave underutilised plants reliant on permanent support.

Measure Angola’s current trajectory against that list and the mismatch is hard to miss. The volume-first strategy, the reliance on foreign operators, and the tilt toward smaller stones all move away from the conditions associated with success, not toward them. Angola’s 2026 upstream target of 16.2 million carats at $150 per carat is the price signal its processing economics would need to catch.

Botswana remains the closest existing example of what works, cited by Bain, De Beers, and the World Bank as the leading African case. Even so, it stays vulnerable to downturns and dependent on De Beers-linked supply, which shows how narrow the path to durability really is.

There is one consensus most analysts share: African producers should not try to out-compete India in small-stone, mass-market processing. That is the segment where India’s labour cost, cluster depth, and efficiency are most pronounced and least replicable in African operating environments.

That gives you a three-variable checklist for any African processing announcement. Look at the stone quality mix, the depth of downstream integration, and whether the operation is a cluster or an isolated factory. Those three questions separate genuine value creation from policy-driven capacity.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Past performance does not guarantee future results, and financial projections are subject to market conditions and various risk factors.

The competitiveness verdict is still being written

Angola’s 2025-2026 processing expansion is a genuine policy achievement, and 126.5% growth in polished export volume is not nothing. But it is an early-stage indicator, not proof of a durable competitive position. The infrastructure is going up; whether it earns a return is a separate question.

Three variables will decide whether this cycle breaks from the African pattern or repeats it:

• Rough assortment shift: whether producers can steer their supply toward higher-value stones where India’s advantage weakens
• Cluster depth: whether foreign-operated hubs develop genuine local financing, tooling, and certification over time
• Market conditions: whether polished demand recovers enough to make African-cost processing self-sustaining without permanent subsidy

The base case is not encouraging. African cutting plants closed and downsized after the 2008 and 2015 downturns, and World Bank and African Development Bank analysis warns that mandates without genuine competitive advantage tend to leave underutilised capacity rather than lasting industries.

Treat current African diamond processing expansion as an option on a supply chain upgrade rather than a confirmed value driver. Right now the value in African diamonds still accrues disproportionately at the mine gate and at the retail end, while the middle stage stays contested and fragile.

The monitoring checklist writes itself. Track rough assortment, cluster depth, and market conditions across the annual reports of Angola, Botswana, Namibia, and South Africa, and you will see well before the headlines whether beneficiation is converging toward economic defensibility or drifting away from it.

For investors wanting a broader market perspective alongside the country-level data, our full explainer on Africa’s diamond industry dynamics examines how producer-country strategies interact with global buyer behaviour and rough supply concentration.

These forward-looking assessments are speculative and subject to change based on market developments and producer performance.