
In the 1870s, enormous diamond deposits were discovered in South Africa, threatening to flood the market and crater prices. A British businessman named Cecil Rhodes responded by buying up nearly every major mine on the continent and consolidating them under a single company: De Beers.By the early 20th century, De Beers controlled roughly 90% of the world's rough diamond supply.The company then carefully rationed how many diamonds reached the market, stockpiling surplus stones whenever supply threatened to exceed demand. Scarcity was not a geological fact. It was a managed fiction.
The cultural mythology was equally manufactured.Before 1938, diamond engagement rings were not a widespread tradition in America. That year, De Beers hired the ad agency N.W. Ayer & Son to change that. The campaign produced the slogan "A Diamond Is Forever" in 1947 — still ranked as one of the most effective advertising lines ever written — and within decades, diamond engagement rings went from a minority custom to an assumed social obligation. The percentage of American brides receiving diamond rings rose from roughly 10% in the 1930s to over 80% by the end of the century.
The Daily Brief notesthat the artificial scarcity began to unravel when lab-grown diamonds — chemically identical to mined ones — entered the mass market. De Beers, unable to distinguish its product from a synthesized replica, eventually began selling lab-grown diamonds itself.
Rare, eternal, irreplaceable: all marketing. The diamond is just compressed carbon. The ring is real. The scarcity never was.














