The stone on the river: 1866
The story of African diamonds begins with an unremarkable moment. Erasmus Jacobs, the son of a Boer farmer, found a transparent pebble on the south bank of the Orange River near the De Kalk farm. The exact date is not recorded. His family let his sisters play with it for a time. Their neighbour Schalk van Niekerk, who had heard stories about diamonds being found in riverbeds, asked to take the stone for examination.
Van Niekerk sent it to Dr. William Guybon Atherstone, a physician and amateur geologist in Grahamstown (now Makhanda), who was one of the few people in the Cape Colony with enough knowledge of mineralogy to identify it. Atherstone confirmed in 1867 that the stone was indeed a diamond. He submitted it for further confirmation to James Gregory, a geologist, who somewhat embarrassingly declared it could not be a diamond because South Africa was geologically unsuitable. Gregory was wrong. Atherstone was right.
The Eureka Diamond — as it came to be known — was purchased by the Governor of the Cape Colony, Sir Philip Wodehouse, for £500, and was eventually displayed at the Paris Exhibition of 1867. The news that a diamond had been found in southern Africa attracted immediate interest, but it was not yet a rush. One stone, however impressive, was not enough to upend the existing order.
The rush begins: the Star of South Africa, 1869
What turned interest into frenzy was a second stone, found two years later by a San (Bushman) shepherd near the Orange River and traded through several hands before reaching Schalk van Niekerk, the same neighbour who had first noticed the Eureka. Van Niekerk traded his entire flock of sheep, ten oxen, and a horse for the stone. He then sold it for £11,200 — a fortune in 1869 — to a diamond merchant who sent it to London for cutting.
The Star of South Africa weighed 83.5 carats in the rough and produced a 47.69-carat cut stone. When it was shown in London, the British Colonial Secretary, Lord Kimberley, is said to have declared: "This is the stone that is to make South Africa." He was right, though the making would be complicated and violent.
The news of the Star triggered a rush. Prospectors, fortune-seekers, merchants, and adventurers poured into the Northern Cape from across South Africa, from Britain, from Australia, from the United States. By 1870, thousands of people were working the river banks of the Vaal and Orange Rivers, panning gravel in the traditional alluvial method.
The birth of Kimberley: when diamonds came out of the ground
The river diggings were productive but limited. The real transformation came in 1871 when prospectors moved away from the rivers and began digging in dry land — the farm of two brothers named De Beer, about 30 kilometres from the Vaal River.
What they found beneath the surface of the De Beer farm changed geological understanding permanently. Instead of the alluvial deposits carried by rivers from a distant source, the De Beer farm sat directly on top of a kimberlite pipe — a cylinder of diamond-bearing rock that extended deep into the earth, the original source of the diamonds that had been washing into rivers for millions of years.
When diggers began breaking through the surface layer and finding diamonds directly in the pipe material, the scale of what was below became apparent. The pipe could be dug deeper and deeper indefinitely, yielding diamonds as long as the kimberlite lasted. This was not a placer deposit to be worked out in a season. This was a geological resource that could sustain industrial-scale mining for decades.
Within months, the De Beer farm had been transformed into the largest diamond mine in the world. The settlement that grew up around it was named Kimberley, after the same Lord Kimberley who had admired the Star of South Africa. The hole that the miners dug — still visible today and now called the Big Hole — eventually reached 240 metres deep and 463 metres wide, making it one of the largest hand-dug excavations in human history. It was the work of approximately 50,000 miners operating with picks, shovels, and a complex system of ropes and buckets before steam machinery arrived.
The discovery that changed geology: what kimberlite told the world
The Kimberley discoveries did not just change the diamond industry. They changed science. Before 1871, nobody knew where diamonds came from at a geological level. India had alluvial deposits, Brazil had alluvial deposits — the diamonds were there, but their origin was unclear. The Kimberley pipe revealed the answer.
The volcanic rock that carried the diamonds to the surface — a type of peridotite formed at extreme depth and pressure — was named kimberlite after the city, and that name has been used in geology ever since. Understanding kimberlite allowed geologists to search for diamond deposits systematically: find the pipes, find the diamonds. This knowledge shaped every major diamond discovery that followed — in South Africa, in Botswana, in Russia, in Canada, in Australia.
The discovery also demonstrated something about the economics of diamond mining that still holds today. A kimberlite pipe requires enormous capital investment to mine: deep shafts, heavy machinery, industrial crushing and processing facilities. This is not something individual prospectors can do with picks and shovels. It requires companies. And companies, in the competitive and chaotic environment of the 1870s Kimberley fields, tended toward consolidation.
Cecil Rhodes, Barney Barnato, and the birth of De Beers
The early Kimberley fields were anarchic. Thousands of individual claimholders dug side by side in a progressively deepening pit, their claims getting smaller and more dangerous as the hole went deeper. The walls collapsed, the pumping of groundwater was uncoordinated, and the diamonds that came out were sold to whoever offered the best price — driving prices down and making long-term planning impossible.
Into this chaos came Cecil Rhodes, the son of a British vicar, who arrived in South Africa at seventeen for his health and ended up at the Kimberley fields in 1871. He was not immediately successful, but he was patient and strategic. He understood that the chaos of individual claims would eventually resolve into consolidation, and he positioned himself to benefit.
Through the 1870s and early 1880s, Rhodes systematically acquired claims and bought out struggling miners. His primary rival was Barney Barnato, a London-born entrepreneur who had built a competing diamond empire in the Kimberley fields through equal parts audacity and commercial intelligence. The two men controlled the majority of Kimberley's diamond production by the mid-1880s, and their competition — buying each other's shares, undercutting prices, attempting hostile acquisitions — was the defining commercial drama of the era.
Rhodes won. In 1888, after years of financial manoeuvring and with the backing of the Rothschild banking house in London, Rhodes acquired Barnato's company in what was at the time one of the largest financial transactions in history. The combined entity became De Beers Consolidated Mines, with Rhodes as its first chairman. De Beers controlled approximately 90 percent of the world's diamond production at founding.
Rhodes's strategy from that point was explicit and ruthless: maintain a monopoly over diamond supply, restrict output to prevent prices from falling, and market diamonds as intrinsically scarce and precious. This strategy — controlling supply, manufacturing scarcity, maintaining price — defined the diamond industry for the next century and in modified form continues to influence it today.
What Africa's diamonds changed about the world
The consequences of the South African diamond discoveries extended far beyond the diamond industry itself.
The price of diamonds changed permanently
Before 1867, diamonds were genuinely rare. India's declining mines produced a limited and diminishing supply. The discovery of kimberlite pipes in South Africa meant that diamond production could be scaled industrially for the first time in history. Without De Beers' deliberate supply restriction, the flood of South African diamonds would have driven prices to a fraction of their previous level. De Beers' monopoly was, from one perspective, the mechanism that kept diamonds expensive despite their suddenly abundant supply.
The engagement ring tradition was commercialised
The connection between diamonds and engagement rings — which had existed in elite European culture for centuries — was dramatically amplified by the abundance of South African diamonds and the marketing machine that De Beers built to sell them. The famous 1947 De Beers advertising campaign "A Diamond is Forever" (created by the N.W. Ayer advertising agency) gave a deliberate cultural meaning to diamond engagement rings that had not previously existed at mass-market scale. This story is told in full in the Diamond is Forever article.
South African history was permanently altered
The diamond rush accelerated the British interest in South Africa's interior in ways that drove the political events of the following decades. The annexation of the diamond fields (which straddled the territory of Boer republics, British colonies, and Griqua and Tswana communities) was a source of political tension that contributed to the broader conflicts culminating in the Anglo-Boer Wars of 1880–1881 and 1899–1902. Cecil Rhodes himself, enriched by diamonds, went on to pursue a political career and territorial ambitions across southern Africa that shaped the region's history in ways whose consequences are still felt today.
The human cost: what the diamond rush meant for Africans
The story of the African diamond discovery is usually told as a story of discovery, wealth, and industrial achievement. It was also a story of dispossession, exploitation, and racial subjugation.
The San shepherd who found the Star of South Africa received ten shillings — a fraction of the stone's eventual value — and is not recorded by name in most historical accounts. The Griqua and Tswana communities whose lands encompassed the diamond fields were displaced, their claims to the territory overridden by colonial legal mechanisms that recognised only European property rights.
The labour force that dug the Big Hole at Kimberley was overwhelmingly African. Black miners initially worked as independent claimholders alongside white prospectors in the early years of the rush. This was progressively curtailed through legislation: the Masters and Servants Acts, pass laws requiring African workers to carry documentation to move freely, compound systems that housed African workers in enclosed barracks under conditions that prevented them from trading independently. By the 1880s, the Kimberley diamond fields operated on a system of racially stratified labour that was a precursor to the formal apartheid structures that would define South Africa for much of the 20th century.
These facts do not negate the economic and scientific significance of the diamond discoveries. They are part of the same story — a story that honest history cannot tell in one dimension only.
The legacy of the Africa discovery in the modern industry
The events of 1866 to 1888 created the structural foundation of the modern diamond industry in ways that are still visible today.
De Beers, though no longer the monopoly it once was, remains one of the world's largest natural diamond mining and marketing companies. Its operations today are conducted through a partnership with the government of Botswana, which holds a 15 percent stake in De Beers as of recent transactions, reflecting the shift from the colonial structure of the original company to a more equitable arrangement with the countries where it mines.
The Kimberley Process Certification Scheme — created in 2003 to address the problem of conflict diamonds — takes its name from the city that was the birthplace of industrial diamond mining, a geographical echo of the industry's origins in the region's colonial history.
The concept of diamond price management — the idea that controlling supply is essential to maintaining value — remains embedded in how the natural diamond industry thinks about itself, even though De Beers' ability to implement it unilaterally has declined sharply since the 1990s as new mines in Russia, Canada, and Australia brought production outside De Beers' control.
And every time a diamond is sold as a symbol of love, commitment, and rarity — which is to say, every engagement ring sold in every jewellery store in every country — it carries the cultural meaning that the South African discovery and the De Beers marketing machine spent a century constructing. The stone that Erasmus Jacobs picked up on the Orange River bank in 1866 is in some sense the origin of all of it.
Frequently asked questions
What happened to the Eureka Diamond?
The Eureka Diamond, the first documented South African diamond, was purchased by the Cape Colony governor and displayed in Paris in 1867. It passed through several owners over the following century and was eventually purchased by De Beers in 1966 — the centenary of its discovery. It is currently on display at the Kimberley Mine Museum in South Africa's Northern Cape, where visitors can see it in person.
Is the Big Hole in Kimberley still visible?
Yes. The Big Hole at Kimberley is one of South Africa's most visited heritage sites. Mining operations ceased in 1914 after the surface deposits were exhausted. The hole subsequently filled partially with groundwater. Today it is preserved as part of the Kimberley Mine Museum complex, which tells the story of the diamond rush and early mining. The hole itself is approximately 215 metres deep (to the water surface) and 463 metres wide at the rim — an extraordinary physical testament to what hand labour with picks and shovels can accomplish at industrial scale.
Did Cecil Rhodes benefit personally from the diamond monopoly?
Enormously. Rhodes used the wealth generated by De Beers to fund political ambitions across southern Africa, including his role in the colonisation of what became Rhodesia (now Zimbabwe and Zambia). He served as Prime Minister of the Cape Colony from 1890 to 1896. His estate at death in 1902 was substantial by any measure of the era. He endowed the Rhodes Scholarships at Oxford University, which continue to bear his name and fund postgraduate study for international students. His legacy is deeply contested: celebrated for philanthropic and economic achievements by some, condemned for the methods of colonial dispossession and exploitation that funded those achievements by others.
Why did De Beers restrict diamond supply if they had so many diamonds?
Because abundance destroys value. If all the diamonds produced by the Kimberley fields had been sold freely into the market in the 1880s and 1890s, the price per carat would have collapsed — potentially to the level of semi-precious stones. Rhodes understood this from the beginning: the value of diamonds depended on their perceived scarcity. By controlling supply through stockpiling, quota agreements with mine operators, and centralised marketing, De Beers maintained price levels that made diamond mining profitable and diamonds desirable. The strategy was a commercial masterstroke, even if its long-term sustainability depended on maintaining a market position that eventually proved impossible to hold as production expanded globally.