How the Diamond Industry Controlled Supply
The mechanism by which De Beers maintained diamond prices through perceived scarcity was straightforward in concept, though extraordinary in scale and execution.
De Beers operated what was called the Central Selling Organisation, a single channel through which the vast majority of rough diamonds from mines around the world were sold. Producers who participated in this system, and there were strong incentives and significant pressures to do so, sold their output to De Beers, which then sorted, valued, and released the diamonds to the market in quantities carefully calibrated to sustain prices.
When market demand softened, De Beers reduced releases and stockpiled more inventory. When demand was strong, releases increased. This managed rhythm meant that diamond prices did not behave the way prices for other commodities behave in response to supply and demand fluctuations. They were stable and consistently elevated because one entity effectively controlled the tap.
This system began to unravel in the late twentieth and early twenty-first centuries as new major diamond-producing nations including Australia, Canada, and Russia brought significant new supply to market through channels outside De Beers control. The discovery and development of mines in these countries produced major producers who chose to operate independently rather than within the De Beers framework.
By the early 2000s, De Beers market share had fallen significantly from its peak, and the company formally abandoned its stockpiling strategy and repositioned itself as a producer and retailer rather than a market controller. The era of centralized supply management that had defined the diamond market for over a century had effectively ended.
The legacy of that era, however, persists in consumer expectations. Prices established over decades of managed scarcity do not reset immediately simply because the management mechanism has changed, and the emotional and cultural value attached to diamonds by generations of marketing does not dissolve with the business strategy that created it.