• Zimbabwe remains Africa’s highest-taxed diamond producer with a 10% royalty while global rough diamond prices have collapsed by 74% since 2020
• RioZim’s decision to sell its 22.2% stake in Murowa Diamonds reflects the commercial unsustainability of private diamond mining under current fiscal and regulatory framework
• Botswana and Angola have already begun restructuring their diamond strategies through increased state marketing participation and value addition

Harare- De Beers has cut its prices in July 2026, reflecting growing pressure as weak Chinese luxury demand, the rapid expansion of lab-grown diamonds, and increased rough supply from producers such as Angola fuelled one of the industry's most severe and prolonged downturns. The price cut, which brought De Beers' official prices, which had been 5% to 50% above secondary market levels depending on the stone category, much closer to current market prices is the formal surrender of a pricing style that De Beers maintained for 137 years.

It is also the most powerful possible signal to Zimbabwe's Ministry of Mines and Ministry of Finance that the diamond policy framework governing Africa's seventh largest producer was designed for a market that no longer exists.

Zimbabwe's diamond industry faces a long-term decline driven by a 74% global rough diamond price collapse, rising lab-grown competition, and high 10% royalties.

RioZim has announced plans to sell its 22.2% stake in Murowa Diamonds, along with key mining assets, as part of a strategy to tackle a USD 76.5 million debt, and Botswana is accelerating its transition toward renewable energy with a USD 100 million investment in the 100-megawatt Tati Solar Project, as falling diamond prices put increasing strain on the country's finances.

These three developments, arriving simultaneously in July 2026, constitute the most concentrated forcing event for Zimbabwe's diamond policy reform that the sector has produced in a decade.

The country that does not respond to all three is the country that will be defending a 10% royalty on a declining revenue base while its competitors reposition for whatever the diamond industry becomes after the lab-grown disruption completes its restructuring of global demand.

De Beers cut official diamond prices at its first regular sale of 2026, ending its attempts to support a market that has been in freefall for three consecutive years. Lab-grown diamonds now account for 52% of US engagement ring centre stones, a stunning reversal from just 3% in 2018. The pace of that reversal is the most significant single statistic in the diamond industry's history.

Lab-grown diamond production technology has improved faster than most industry participants anticipated even five years ago. The price gap between natural and synthetic stones is not merely large, it is widening on the synthetic side as production scales.

Importantly, lab-grown diamonds are not constrained by geology.

Natural 1-carat diamonds fell to about USD 4,200 in 2025, down from about USD 6,000 in 2021. Lab-grown 1-carat diamonds now cost approximately USD 750 to USD 1,000 in 2026, down 74% from 2020. A consumer who wants a 2-carat diamond engagement ring can now choose between a natural stone at approximately USD 15,000 and a laboratory-grown stone, optically, chemically, and physically identical at approximately USD 2,000.

For the overwhelming majority of consumers making the most emotionally significant jewellery purchase of their lives under real-world budget constraints, that price difference is determinative. Pandora, one of the world's largest jewellery brands, dropped natural diamonds from its collections entirely and pivoted to lab-grown and alternative stones. Its sales have grown since the switch.

Anglo American, which owns 85% of De Beers, took a USD 2.3 billion pre-tax impairment on the unit in its 2025 results. Total write-downs on De Beers over three years reached USD 6.8 billion. Anglo American posted a USD 3.7 billion net loss for 2025 as a result. De Beers' own EBITDA loss widened to USD 511 million in 2025 from USD 25 million the prior year.

Thus, the company that has accumulated USD 6.8 billion in writedowns in three years on a single asset has confirmed with its own balance sheet what the production and pricing data has been indicating for longer, the structural downswing in natural diamond demand is nolonger a cyclical correction from which the industry will recover to prior levels, but a permanent market restructuring whose end state is a smaller, more differentiated natural diamond market serving consumers for whom the provenance, rarity, and ethical narrative of a natural stone carries sufficient premium to justify a price differential of several thousand dollars over a laboratory-grown alternative.

Zimbabwe's diamond policy must be designed for that end state, not for the market that existed before 2020.

Zimbabwe's Position: Seventh Globally, Highest-Taxed in Africa

Zimbabwe is the seventh-largest diamond producer globally, operating across three primary production sites which are the Marange diamond fields in Manicaland province, operated by the Zimbabwe Consolidated Diamond Company, the Murowa kimberlite mine in the Midlands, operated by RZM Murowa, and prospecting operations by ALROSA Zimbabwe in the Chimanimani region.

Zimbabwe's diamond exports across the first ten months of 2025 reached USD 130.12 million, a 36% drop from 2024 and the lowest in almost five years. The trajectory of Zimbabwe's diamond revenue across comparable periods, USD 161.29 million in the first ten months of 2021, declining through subsequent years to USD 130.12 million in 2025, confirms that Zimbabwe's diamond revenues are not immune to the structural forces reshaping the global market regardless of domestic production decisions.

Against that declining revenue backdrop, Zimbabwe maintains a 10% royalty on gross diamond revenues, a rate that leaves razor-thin net returns after accounting for additional taxes like VAT on imports at 15% and withholding taxes, with scant capital remaining for expansion, modernizing equipment, investing in solar to combat 20% power deficits, or pursuing value addition like local polishing.

Zimbabwe's tax policies significantly affect its diamond industry's competitiveness. The 10% royalty was reduced from 15% in 2019 as a competitiveness measure, but the market conditions that made 10% tolerable in 2019 at rough diamond prices of USD 2,500 to USD 3,000 per carat do not replicate at 2026 prices of USD 900 per carat.

Therefore, a royalty rate whose absolute dollar cost per carat has not changed, applied to a revenue base that has declined 74% from its 2020 peak, extracts a proportionally larger share of producers' declining margins than its percentage suggests. The 10% rate that consumed a manageable share of revenue at USD 3,000 per carat is consuming a commercially damaging share at USD 900 per carat.

The 30% foreign currency surrender, exchanged for ZiG at rates 30% below parallel markets, builds arrears and restricts dollar access for critical imports. Power shortages erode at least 20% of output potential, per ZNCC estimates, while ageing infrastructure inflicts losses like ZCDC's 1.4 million carats in 2023. The combination of the 10% royalty, the 30% forex surrender, and infrastructure-driven production losses creates a cost structure whose aggregate effect on mining economics is closer to a 25% to 30% effective revenue extraction than the nominal 10% royalty rate implies.

Operating in that environment at 2026 diamond prices makes Zimbabwe's diamond mines commercially marginal at best and financially distressed at worst, the precise condition that RioZim's decision to sell its Murowa stake reflects in the most commercially explicit possible terms.

RioZim's Exit

RioZim announced plans to sell its 22.2% stake in Murowa Diamonds, along with four diamond claims valued at USD 4.6 million and other mining assets, as part of a strategy to tackle a USD 76.5 million debt. The sale targets a USD 60.8 million liability owed to major shareholder RZM Murowa. Over 15 potential investors have expressed interest in supporting the company through a mix of equity and debt financing. The RioZim exit from its diamond position is simultaneously a corporate survival decision and a market signal.

A mining group that has operated Murowa since acquiring it from Rio Tinto in 2015 has concluded that its diamond asset's value, in the current and projected global diamond price environment, is insufficient to service the debt load its ownership has accumulated. That conclusion, made by a management team with operational experience of Zimbabwe's specific diamond geology, fiscal regime, and infrastructure environment is the most informed available assessment of whether Zimbabwe's current diamond policy framework makes diamond mining commercially viable for private operators.

Rio Tinto's letter to employees before its own departure from Murowa warned that the country's taxes, which are used to pay government workers, are too high and were "weighing down" the business. That letter was written before the 74% decline in rough diamond prices that has occurred since 2020. The conditions that caused Rio Tinto to identify Zimbabwe's tax regime as commercially unviable at 2015 price levels have been compounded by a decade of diamond price deterioration and lab-grown disruption.

RioZim's current exit is the second time the same asset has changed hands partly because Zimbabwe's fiscal environment makes private diamond mining increasingly difficult to sustain, a pattern whose third repetition, if a successor investor acquires the Murowa stake and subsequently also exits under financial distress, would confirm a systemic policy failure rather than a company-specific one.

What Botswana Did and What It Is Now Doing

Botswana's diamond story is simultaneously the best and the worst comparator for Zimbabwe's situation, best, because it demonstrates what coherent long-term diamond policy can achieve and worst because it shows with complete clarity that even the most successfully managed diamond economy in Africa cannot protect itself from a structural market disruption that its policy framework was not designed to anticipate.

Diamonds account for 25% of Botswana's GDP and 75% of foreign exchange earnings, prompting government diversification efforts including De Beers stake expansion and renewable energy investments. Debswana slashed 2025 production by 40% amid a 50% revenue drop, forcing mine closures and workforce reductions in 2024. The economy contracted by an estimated 3% in 2024, with a further 1-3% contraction forecast for 2025.

The fiscal deficit exploded to 7.1% to 11% of GDP for 2024/25, the widest in sub-Saharan Africa. Foreign exchange reserves fell from 8.5 months of import cover in 2023 to a precarious 3.2 to 5 months by mid-2025. Government deposits at the central bank, once 50% of GDP, are now nearly exhausted.

Botswana's response across 2025 and 2026 contains the specific policy adjustments that Zimbabwe's government should study most carefully. A new agreement with De Beers extended Debswana mining licenses to 2054 and gradually increased the state's share of rough diamond sales to 50%, up from 25%, over the next decade, and a new sovereign wealth fund was established in September 2025 to manage state assets and invest diamond-related revenues in high-growth areas such as agro-processing, renewables, and tourism.

Debswana will invest in a major solar farm close to its Jwaneng mine that would enable carbon-neutral mining and feed the grid. Debswana's diversification reflects a broader diamond industry pivot amid the prolonged slump.

Only last week Botswana Diamonds changed its name to Botswana Minerals, reflecting its own switch in emphasis towards copper exploration. Botswana is accelerating its transition toward renewable energy with a USD 100 million investment in the 100-megawatt Tati Solar Project, as falling diamond prices strain the country's finances.

Botswana's most commercially significant long-term intervention, however, is not the solar investment or the De Beers renegotiation, it is the Okavango Diamond Company's increasing share of rough production from 25% to 50% over the decade combined with Botswana's HB Antwerp partnership, which moves the country from raw material exporter to trading and value-chain participant.

Botswana is not merely adjusting royalty rates, but restructuring its position in the diamond value chain to capture the polished diamond margin whose value is sustainable even as rough prices decline, because the labour and skill involved in cutting, polishing, and marketing adds value that the falling price of rough does not eliminate.

Angola and Russia, the Policy Lessons Beyond Botswana

Angola's Sociedade de Comercialização de Diamantes de Angola Sodiam  and the Lulo diamond fields offer the second most instructive African policy comparison. Angola has consistently maintained lower royalty rates than Zimbabwe and has combined state ownership through Endiama, the national diamond company, with structured private sector partnerships that attract foreign capital and technology without ceding full control to foreign operators.

Angola's approach to its exceptional Lulo mine, a partnership between Endiama, Lucapa Diamond Company, and the local Rosas and Petalas entity  is a model for how a state entity can participate in diamond revenues at multiple levels simultaneously, royalty from production, equity participation through Endiama, and marketing margin through the state's selling agency. The result is that Angola's government captures more value per carat than Zimbabwe's 10% royalty delivers, despite Angola's nominal royalty rate being comparable, because it captures royalty plus equity return plus marketing margin rather than royalty alone.

Russia, led by ALROSA, balances state oversight with private efficiency. ALROSA's joint venture with ZCDC exemplifies this, bringing expertise and capital. Zimbabwe could expand such partnerships, ensuring state revenue while leveraging private sector innovation. Russia's focus on deep mining could guide Zimbabwe to tap deeper reserves.

ALROSA’s Zimbabwe operations remain in the prospecting phase. Through its 70/30 joint venture with ZCDC, the company is conducting exploration under 40 Special Grants, with Chimanimani as the initial focus area. The JV was set up in 2019 to explore greenfield deposits and, if viable, move to mining and independent sale of rough diamonds. ALROSA committed an initial $12 million to the programme and in 2025 announced plans to double that investment, citing Zimbabwe’s investor-friendly policies under the Second Republic.

The move from prospecting to production will depend on two things: exploration results that identify economically viable deposits, and finalisation of standard mining fiscal terms on royalties, forex retention and beneficiation for a capital-intensive diamond operation.

India's Surat cutting and polishing centre provides the third international lesson whose applicability to Zimbabwe is direct and largely unexplored. India built the world's largest diamond cutting and polishing industry, processing approximately 90% of the world's rough diamonds by volume  through a combination of low labour costs, government support for the gem and jewellery export sector through the Gems and Jewellery Export Promotion Council, and zero import duty on rough diamonds that reduces the cost of processing below that of any alternative location.

Zimbabwe's Marange and Murowa rough diamonds currently leave the country as unprocessed rough, with their cutting margin captured in Antwerp, Mumbai, and Tel Aviv rather than in Harare. The policy instrument that would begin to change that, an investment incentive for a local diamond cutting and polishing facility, combined with a royalty credit for value added in-country before export is precisely the beneficiation mechanism that Zimbabwe's Vision 2030 targets without specifying the fiscal architecture that would make it commercially attractive to investors.

What Zimbabwe's Policy Must Now Include

The diamond policy reform that Zimbabwe requires in the current market environment has five specific components whose implementation is sequentially urgent rather than simultaneously achievable.

The first is an immediate royalty reduction from 10% to 6% to 7% for the period of the current diamond market depression, with a transparent indexation mechanism that adjusts the rate proportionally to the movement in global rough diamond prices. A royalty that is fixed in percentage terms while the revenue base declines imposes an increasing burden on mining economics at precisely the moment when operators most need capital for equipment maintenance, energy investment, and operational efficiency improvement. An indexed royalty that rises when prices rise and falls when prices fall aligns the government's fiscal interest with the sector's commercial health rather than extracting a fixed percentage from a declining base.

The second is the restructuring of the forex surrender requirement from 30% to a more commercially sustainable level, consistent with the gold sector's arrangement that gives diamond producers access to sufficient hard currency to fund imported inputs, equipment, and debt service without accumulating the arrears that have contributed to RioZim's financial distress. The 30% forex surrender, exchanged for ZiG at rates below parallel markets, builds arrears and restricts dollar access for critical imports.

An operator that cannot access the dollars its exports generate cannot maintain the equipment whose failure reduces production, which reduces the revenue from which the government collects its royalty. The forex surrender is circular self-harm in a falling price environment.

The third is an investment incentive for local beneficiation, specifically a cutting and polishing facility at a location with reliable power supply, whether at Marange itself with the dedicated power solution that ZCDC's capital programme has contemplated, or at a designated SEZ location with access to grid power. The beneficiation premium, the difference between rough diamond export value and polished diamond export value for the same carat weight, ranges from 30% to 100% depending on stone size and quality.

Zimbabwe's Murowa production, which includes gem-quality stones including large specials, contains precisely the stone qualities whose polishing premium is highest and whose local cutting would generate the greatest incremental export value.

The fourth is an honest assessment of ZCDC's operational efficiency against international benchmarks, with a time-bound restructuring plan that addresses the infrastructure losses, ZCDC's 1.4 million carats lost in 2023 to ageing infrastructure whose scale represents more lost revenue than any royalty rate adjustment can recover.

A 1.4 million carat infrastructure loss at USD 900 per carat is USD 1.26 billion in foregone export revenue. That is not a fiscal policy problem, but a capital investment problem whose solution, upgrading ZCDC's processing infrastructure, electrifying its operations with dedicated renewable power, and addressing its security deficit that allows the smuggling that drains 10% to 20% of potential value, costs money that a reduced royalty rate and restructured forex surrender would make available.

The fifth is the natural diamond differentiation strategy whose commercial logic the lab-grown disruption has made necessary. Lab-grown diamonds are indistinguishable from natural ones in appearance and increasingly affordable, reshaping consumer preferences particularly among younger buyers prioritising ethical and cost-effective alternatives.

The natural diamond's only sustainable long-term competitive advantage over a laboratory-grown stone is its provenance, the geological story, the artisanal mining contribution, the community royalty, the Kimberley Process certification, and the traceability that converts a Marange or Murowa stone from a commodity into a verified natural object formed over billions of years beneath Zimbabwe's crust. In a USD 97 billion market increasingly bifurcated by synthetics, emphasising traceable, ethical naturals could premium-position Zimbabwe's output.

That premium positioning requires a marketing investment, a blockchain traceability infrastructure, and a provenance story whose credibility the Kimberley Process alone is insufficient to provide, but it is the only long-term strategy that makes Zimbabwe's natural diamond production commercially resilient against competition from a laboratory product whose production cost is falling by approximately 15% to 20% per year.

The Window and the Urgency

Botswana's GDP contracted for two consecutive years under the weight of a diamond market disruption it saw coming but could not fully prepare for at its level of dependency. Zimbabwe, whose diamond contribution to export revenues is significant but not at Botswana's existential level, has more policy room to adjust than Botswana had, more time, more fiscal flexibility, and a diversified export base that gives diamond reform a softer landing than Botswana's singular dependency produced. That relative advantage is also a temptation: the temptation to treat Zimbabwe's diamond policy as less urgent than it is because gold revenues at USD 4,873 per ounce are currently providing the foreign currency surplus that makes every other sector's underperformance temporarily manageable.

The De Beers diamond price cuts announced in July 2026 represent the formal acknowledgement that the pricing illusion, long maintained through confidential discounted sales running in parallel with artificially elevated official prices, is over.

Therefore, a sector whose global pricing anchor has formally surrendered its ability to maintain prices above market cannot be managed with the policy tools designed for a market in which that anchor held. Zimbabwe's diamond policy was designed for a De Beers-anchored world, and that world ended in July 2026.

The policy that replaces it must be designed for a world in which natural diamond prices are market-determined, lab-grown competition is structural and permanent, and the competitive advantage of a natural diamond is its provenance rather than its price.

RioZim is selling its Murowa stake, Botswana is building solar farms, and De Beers is cutting prices, while Zimbabwe is still charging 10%. The sequence of corrections required to align Zimbabwe's policy with the market that actually exists is not complex, it is simply overdue.

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