Every diamond on someone's hand arrived there through a chain of events stretching back centuries. Understanding that chain — the discoveries, the commerce, the cultural shifts — changes the way you see the stone.
Diamonds were not always engagement rings. They were not always cut. For most of their history, they were rare, cloudy, and prized more for their hardness than their sparkle. The diamond you admire today is the product of geological accident, human ingenuity, and a few pivotal moments that rewired what the world considers precious.
India: Where It Began
The story starts in India, along the riverbeds of Golconda in present-day Andhra Pradesh. For roughly two thousand years — from around the 4th century BC to the early 18th century — India was the world's only known source of diamonds.
These early stones were not faceted. They were uncut crystals, valued for their adamantine lustre and mythic hardness. In Hindu texts, diamonds possessed spiritual power. Warriors set them into armour. Rulers wore them as talismans. The Arthashastra, Kautilya's treatise on statecraft written around 300 BC, includes passages on diamond trading and taxation — evidence that a structured diamond market existed in India long before Europe had any notion of the gem.
The stones that did reach the West arrived via ancient trade routes — through Persia, along the Silk Road, and eventually into the courts of Rome. Pliny the Elder described the diamond in his Natural History (77 AD) as the most valuable of all things, though even he had never seen one cut. For the Romans, a diamond's worth lay in its indestructibility, not its brilliance.
Medieval Europe: From Talisman to Crown Jewel
Diamonds trickled into medieval Europe as curios and sacred objects. They were mounted uncut in ecclesiastical rings and royal crowns — their octahedral crystal faces left intact, sometimes polished but never shaped. The belief persisted that cutting a diamond would destroy its power.
That changed in the late 14th and 15th centuries, when European lapidaries began experimenting with diamond cutting. The earliest technique, point cutting, simply polished the natural crystal faces. By the mid-1400s, table cutting — grinding down the top of the octahedron to create a flat facet — gave diamonds their first deliberate geometry.
The transformation accelerated in 1475, when the Flemish gem cutter Lodewyk van Berquem is credited with perfecting the art of diamond faceting using diamond dust on a rotating wheel, or scaife. Working in Bruges, van Berquem demonstrated that diamonds could be shaped to reflect light in ways the uncut crystal never could. This was the technical breakthrough that would eventually make Antwerp the centre of the diamond trade — a position it holds to this day.
By the Renaissance, diamonds had become the gemstone of European aristocracy. Agnes Sorel, mistress of Charles VII of France, is often cited as the first commoner to wear diamonds prominently, in the 1440s — a gesture that began to loosen the gem's association with royalty alone.
Brazil: A New Source, A New Market
By the early 1700s, India's alluvial deposits were nearing exhaustion. Supply had dwindled. Then, around 1725, diamond-bearing gravels were discovered in the Portuguese colony of Minas Gerais, Brazil.
The impact was immediate and dramatic. Brazilian diamonds flooded European markets, substantially increasing supply and — initially — depressing prices. Portuguese traders, concerned about devaluing their finds, reportedly shipped stones through Goa to disguise their origin as Indian.
Brazil dominated global diamond supply for roughly 150 years. During this period, diamond cutting techniques continued to advance. The old mine cut emerged — a cushion-shaped stone with a high crown and small table that maximised candlelight sparkle in the drawing rooms of Georgian and Victorian Europe. These are the diamonds you see in antique jewellery from this era: warm, deep, and distinctly different from the bright white precision of a modern round brilliant.
South Africa: The Rush That Changed Everything
In 1866, a fifteen-year-old boy named Erasmus Jacobs found a translucent stone on the banks of the Orange River near Hopetown, South Africa. It was identified as a 21.25-carat diamond, later named the Eureka. Two years later, an 83.50-carat stone — the Star of South Africa — was discovered nearby.
The South African diamond rush had begun.
What happened next was unprecedented in scale. Within a decade, thousands of prospectors had descended on the region. The discoveries were not alluvial — they were kimberlite pipes, volcanic formations that pushed diamonds from deep within the earth to the surface. This was an entirely new geological model for diamond deposits, and it meant supply on a scale India and Brazil had never approached.
The rush centred on the area around Kimberley, where four major pipes were identified. The digging was chaotic. Individual claims of roughly 10 by 10 metres dotted the landscape, creating enormous open pits as miners dug deeper. The Big Hole at Kimberley, excavated entirely by hand, eventually reached 240 metres in depth — a monument to human tenacity and the feverish economics of diamond mining.
De Beers: Controlling Supply, Creating Desire
Out of this chaos emerged Cecil Rhodes, a British-born entrepreneur who recognised that diamonds, unlike gold, derived their value not from utility but from scarcity — and scarcity could be managed.
By 1888, Rhodes had consolidated the Kimberley mines under a single entity: De Beers Consolidated Mines. Through a series of aggressive acquisitions, De Beers gained control of roughly 90 percent of the world's diamond production. The company established the Central Selling Organisation (later the Diamond Trading Company) to regulate the flow of rough diamonds to the market, carefully matching supply to demand.
This was not merely a business strategy. It was the creation of an entirely new economic model for a luxury commodity. De Beers did not just mine diamonds. It controlled perception.
The most consequential chapter of that control began in 1938, when De Beers engaged the American advertising agency N.W. Ayer. The brief was simple: make Americans want diamonds. At the time, diamond engagement rings were neither traditional nor universal in the United States. They were one option among many, and sales had been declining through the Depression.
N.W. Ayer's response was not a single advertisement but a cultural campaign. The agency placed diamonds on film stars, arranged editorial coverage linking diamonds to romance, and commissioned artists and fashion designers to feature them. Then, in 1947, copywriter Frances Gerety wrote four words that would redefine an industry:
A diamond is forever.
The line worked because it was emotionally true — even if, commercially, it also discouraged the resale market. By 1965, eighty percent of American brides received a diamond engagement ring. What had been a marketing initiative had become a cultural norm. The "two months' salary" guideline, introduced by De Beers in the 1980s, further anchored the diamond's place in the proposal ritual.
The Modern Cut: Engineering Brilliance
While the market was being transformed, so was the stone itself.
In 1919, Marcel Tolkowsky, a young Belgian mathematician from a family of diamond cutters, published his thesis Diamond Design. In it, he calculated the ideal proportions for a round brilliant-cut diamond — the angles and ratios that would maximise the return of light to the viewer's eye. His work established the 57-facet (58 with the culet) round brilliant as the mathematical ideal, and it remains the foundation of modern cut grading.
Tolkowsky's contribution cannot be overstated. Before his work, cutting was guided by intuition and tradition. After it, cutting became a discipline grounded in optics and geometry. The round brilliant cut that dominates the market today — accounting for roughly 75 percent of all diamonds sold — is a direct descendant of his calculations.
Subsequent research by the Gemological Institute of America (GIA) and the American Gem Society (AGS) has refined Tolkowsky's model, incorporating computer modelling and ray-tracing technology to evaluate how light behaves within a diamond. But the essential insight was his: a diamond's beauty is not an accident. It is engineered.
Ethical Reckoning: From Conflict to Conscience
The late 20th century forced the diamond industry to confront uncomfortable truths.
Through the 1990s, it became clear that diamond revenues were funding brutal civil wars in Sierra Leone, Angola, the Democratic Republic of Congo, and Liberia. These conflict diamonds — also called blood diamonds — entered legitimate supply chains, and consumers had no way to distinguish them from ethically sourced stones. The human cost was staggering: forced labour, amputations, displacement of entire communities.
International pressure led to the establishment of the Kimberley Process Certification Scheme (KPCS) in 2003, a joint initiative by governments, the diamond industry, and civil society. The scheme requires participating countries to certify that rough diamond shipments are conflict-free. It has meaningfully reduced the flow of conflict diamonds — by most estimates, over 99 percent of the global diamond trade now complies with Kimberley Process standards.
The Kimberley Process was a necessary first step. But critics rightly note its limitations: it defines "conflict" narrowly, focusing on rebel groups while excluding state-sponsored violence and labour abuses. The conversation has since broadened to encompass responsible sourcing in its fullest sense — fair labour practices, environmental stewardship, community development, and supply chain transparency from mine to market.
For Arete Diamond, this conversation is not abstract. It informs how we source, what we disclose, and which supply chains we choose to participate in.
The Contemporary Era: Lab-Grown, Legacy, and Choice
The 21st century has introduced the most significant disruption since the South African discoveries: lab-grown diamonds.
Produced by Chemical Vapour Deposition (CVD) or High Pressure High Temperature (HPHT) methods, lab-grown diamonds are chemically, optically, and physically identical to mined diamonds. They are real diamonds. The distinction is origin, not composition.
Lab-grown stones have expanded access to diamond jewellery at lower price points, and they appeal to consumers concerned about the environmental and social impact of mining. Their share of the market has grown rapidly, particularly in fashion jewellery and bridal categories.
Yet natural diamonds retain a significance that transcends chemistry. A natural diamond is a geological event — formed one to three billion years ago, roughly 150 kilometres beneath the earth's surface, under pressures of approximately 725,000 pounds per square inch. Each one is singular. Each one carries the deep time of the planet in its crystal lattice.
The choice between natural and lab-grown is not a question of quality. It is a question of what you value — and that is a deeply personal decision.
Summary
- India was the sole source of diamonds for roughly two millennia, from the 4th century BC through the early 1700s. The gems were valued uncut, as talismans and symbols of power.
- Diamond cutting evolved in Europe from the 14th century onward, with Lodewyk van Berquem's innovations in 1475 establishing the foundations of modern faceting — and Antwerp's enduring role in the trade.
- Brazil supplied the world from the 1720s to the 1860s, bridging the gap between India's decline and South Africa's emergence.
- The South African discoveries (1866 onward) introduced kimberlite mining and industrial-scale production, fundamentally altering diamond economics.
- De Beers shaped modern demand through supply control and the "A Diamond Is Forever" campaign, transforming an engagement ring from an option into a cultural expectation.
- Marcel Tolkowsky's 1919 thesis established the scientific basis for the modern round brilliant cut, turning beauty into a matter of engineering.
- The Kimberley Process (2003) addressed conflict diamonds, though the broader conversation around ethical sourcing continues to evolve.
- Lab-grown diamonds offer a chemically identical alternative, expanding choice — while natural diamonds carry a geological and emotional weight that remains uniquely their own.
Further Reading
- Ethics & Responsible Sourcing — How the diamond industry approaches ethical supply chains today.
- Conflict Diamonds & the Kimberley Process — A closer look at the certification scheme and its real-world impact.
- Why Antwerp Matters — The city that shaped the modern diamond trade.
- Diamond Cutting & Manufacturing Basics — How rough stones become finished gems.
- The Modern Diamond Pipeline — From mine to market: how diamonds reach you.