Botswana Finds 2,492-Carat Diamond, Second-Largest Ever
Africa · Southern
Key Facts
—The Stone. A 2,492-carat rough diamond, weighing about one pound, was recovered intact at the Karowe mine in August 2024.
—Historic Rank. It is the second-largest rough diamond ever mined, surpassed only by the 3,106-carat Cullinan diamond found in South Africa in 1905.
—Operator. Canadian firm Lucara Diamond Corp. extracted the stone using specialised X-ray transmission technology designed to protect large gems from breakage.
—Economic Weight. Diamonds account for roughly 80% of Botswana’s exports and about one-third of government revenue, making the find a major sovereign asset.
—Market Paradox. The discovery arrives amid a severe global diamond downturn, with prices falling and lab-grown alternatives reshaping consumer demand.
Botswana has unveiled a 2,492-carat diamond, the largest rough stone recovered in more than a century, a discovery that sharpens the global debate about the future of natural diamonds at a moment when the market they command is under structural siege.
A geological marvel emerges at Karowe
The stone was unearthed at the Karowe mine, roughly 480 kilometres north of Gaborone, and presented to the world on 22 August 2024 by President Mokgweetsi Masisi alongside Lucara Diamond Corp. CEO William Lamb.
Described by the operator as exceptional and high-quality, the diamond was recovered intact thanks to X-ray Transmission technology installed in 2017 specifically to identify and safeguard large, high-value stones from the crushing circuit.
Karowe has built an extraordinary track record of producing headline-grabbing gems, including the 1,109-carat Lesedi La Rona and the 1,758-carat Sewelô. This latest find cements the mine’s status as a strategic asset in the global rough-diamond market and reinforces Botswana’s brand as the world’s leading diamond producer by value.
The money behind the 2,492-carat diamond
No official price has been set for the stone, and it has not yet been named, leaving room for a branding strategy that will likely link national identity with luxury positioning. For reference, the 813-carat Constellation diamond from the same mine sold for $63 million in 2016, and industry commentators suggest the new discovery could fetch tens of millions of dollars at auction.
The valuation calculus is complicated by a diamond market in distress. Rough prices fell from nearly $7,000 per carat at the end of 2022 to below $5,000 per carat by late 2024, driven by overstocking ahead of Western sanctions on Russian gems, sluggish demand from the United States and China, and the rapid rise of lab-grown diamonds marketed as ethical and affordable alternatives.
For Botswana, where diamonds represent around 80% of exports and roughly one-third of fiscal revenues, the downturn is macro-critical. The economy contracted by about 5% in the second quarter of 2025, the steepest decline since the pandemic, and S&P Global Ratings downgraded the country’s sovereign credit rating to BBB- citing the diamond slump and weakening fiscal revenues.
Botswana’s diamond model under pressure
Since independence in 1966, when per capita income stood at roughly $80, Botswana has leveraged diamond revenues to build one of Africa’s most compelling development stories, financing free healthcare, education and infrastructure that lifted the country to middle-income status with per capita income around $7,000. The dominant player remains Debswana, a 50/50 joint venture between the government and De Beers, which accounts for roughly 90% of national diamond sales but cut production by about 27% in 2024.
Yet the success model is fragile. Unemployment affects nearly one-third of the working population, inequality measured by a Gini index of 53.3 remains stark, and roughly 45% of the workforce is employed in the public sector, a bureaucratic structure that analysts describe as a behemoth with limited private-sector diversification.
In response, the government has enacted a new rule effective October 2025 requiring that for new mining concessions, a 24% stake must be sold to local private investors if the state declines its own option. The policy aims to build a domestic investor class tied to resource rents without retroactively disrupting existing licences such as Karowe’s.
Great-power currents and the 2,492-carat diamond
The discovery lands at a moment when the geopolitics of critical minerals are reshaping alliances and supply chains, a dynamic we track closely in our pillar series Africa: The New Scramble. Western sanctions on Russian diamonds, intended to punish Alrosa and constrain Moscow’s war financing, have distorted midstream inventories and created openings for non-sanctioned producers like Botswana to market their stones as clean and compliant.
Simultaneously, China’s emergence as a leading producer of lab-grown diamonds has reshaped consumer markets in the United States, where retailers embrace synthetics as cheaper, sustainability-themed products. Botswana’s comparative advantage lies in the ultra-rare, large-stone segment exemplified by the 2,492-carat find, a niche where natural provenance and geological uniqueness remain difficult to replicate at scale.
The historical symbolism is potent. The 3,106-carat Cullinan diamond, cut into stones that now sit in the British Crown Jewels, embodied early-20th-century imperial extraction from southern Africa.
By contrast, the 2,492-carat Botswana stone was unveiled by an African president in an African capital, projecting an image of post-colonial resource sovereignty even as foreign capital from Canada and Anglo-American De Beers retains a central operational role.
What the 2,492-carat diamond means for frontier investors
For investors and professionals watching southern Africa, the stone is both a reminder of the region’s extraordinary mineral endowment and a case study in the limits of resource-dependent development. Botswana still holds an estimated 280 million carats of diamond reserves, equivalent to roughly 11 years of 2023 export levels, but the value realised from those reserves now depends on successfully differentiating natural stones from synthetics and accelerating economic diversification.
The government is actively exploring rare earths and other critical minerals, aiming for in-country processing to retain more value and create jobs. Officials also emphasise intra-African trade corridors and digital platforms under the African Continental Free Trade Area framework, seeking to reduce dependence on Western and Asian consumer markets.
For Latin American readers accustomed to debates about lithium, copper and state equity stakes, Botswana’s trajectory offers a parallel worth studying. The new 24% local ownership rule echoes resource-nationalist impulses seen from Santiago to Jakarta, calibrated to attract foreign operators while building domestic capital markets and a citizen investor class.
What to watch next
The naming, cutting and eventual sale of the 2,492-carat diamond will be a closely watched commercial and political event, testing whether ultra-rare natural stones can still command a premium in a market flooded with lab-grown alternatives. The auction outcome will signal the appetite of high-net-worth buyers and luxury houses for top-tier African provenance at a time when ESG narratives increasingly shape purchasing decisions.
Broader indicators to monitor include Debswana’s production volumes, the pace of diversification into critical minerals, and the implementation of the 24% local equity rule for new concessions. Botswana’s ability to navigate the diamond downturn without fiscal crisis will test whether the country’s celebrated governance model can survive the structural transformation of its founding industry.
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Frequently Asked Questions
How large is the 2,492-carat diamond compared to historic finds?
The 2,492-carat rough diamond is the second-largest ever recovered from a mine, surpassed only by the 3,106-carat Cullinan diamond found in South Africa in 1905. It is the largest diamond discovered in more than a century and the largest ever found in Botswana, weighing approximately one pound.
Who owns the 2,492-carat diamond and what is it worth?
The stone was recovered by Lucara Diamond Corp., a Canadian company operating the Karowe mine in Botswana. No official price has been set, but industry estimates suggest it could fetch tens of millions of dollars, with the 813-carat Constellation diamond from the same mine having sold for $63 million in 2016 as a reference point.
Why does this discovery matter when lab-grown diamonds are rising?
The find highlights Botswana’s strategy of focusing on ultra-rare, large natural stones that remain difficult to replicate synthetically at comparable scale and prestige. In a market increasingly divided between mass-market lab-grown diamonds and high-end natural gems, the 2,492-carat stone reinforces the country’s position in the premium provenance segment that still commands significant value.
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