Ask someone why an engagement ring needs a diamond and most people will say it's tradition.
It isn't, not in the way we assume.
For most of human history, a ring was just a way of marking a promise. No particular stone was required and no particular price was expected.
What we think of today as required, a diamond, a specific cut, a certain size relative to a man's salary, is mostly the result of one of the most successful advertising campaigns of the twentieth century.
The real history of the engagement ring looks almost nothing like the story most of us grew up assuming was true.
Long Before Diamonds, a Ring Meant Something Simpler
Engagement and wedding rings go back much further than diamonds do.
The ancient Romans exchanged rings as part of betrothal customs, often plain iron, worn as a public signal that a match had been agreed to between two families.
The stone itself was not the point. The ring was a marker, not unlike a handshake you could wear.
Centuries later, posy rings became popular across medieval and Renaissance Europe. These were simple gold bands engraved on the inside with a short line of verse or a phrase in French or Latin, a private message meant only for the two people who knew it was there.
A posy ring did not need to be expensive to mean something. It needed to be personal.
The Ring Often Credited as the First
Historians frequently point to 1477 as a turning point, when Archduke Maximilian of Austria gave Mary of Burgundy a gold ring set with thin, flat diamonds arranged in the shape of an M, as part of his marriage proposal.
It is often cited as the first recorded diamond engagement ring in European history, though a diamond engagement ring standard did not follow immediately. Not even close.
Diamonds were extraordinarily rare at the time. The primary source was India, and the stones that reached Europe were expensive enough to remain a luxury reserved for royalty and the wealthiest nobility for the next several centuries.
For almost everyone else, an engagement ring, if a couple exchanged one at all, was far more likely to be a plain band, a colored gemstone, or a family heirloom passed down rather than purchased new.
Diamonds Were Rare Until They Weren't
That began to change in the second half of the nineteenth century.
Large diamond deposits were discovered in South Africa in the late 1860s and 1870s, and the supply of diamonds reaching the world market increased dramatically almost overnight.
This should have made diamonds more affordable and more common, and for a while, it started to. That worried the people who controlled the mines far more than it excited them.
In 1888, businessman Cecil Rhodes founded De Beers Consolidated Mines, bringing the major South African diamond operations under one company.
Over the following decades, De Beers built enough control over the global diamond supply to manage how many diamonds reached the market at any given time, which is precisely what kept prices high even as the actual physical supply of diamonds grew.
A Depression, an Ad Agency, and a Sales Problem
By the 1930s, diamond engagement ring sales in the United States had fallen sharply, a casualty of the Great Depression alongside nearly everything else people considered optional spending.
In 1938, De Beers hired the American advertising agency N.W. Ayer with a specific assignment. Rebuild American demand for diamond engagement rings, and make it last.
The agency's strategy went beyond a normal ad campaign. It aimed to change how an entire culture thought about marriage, love, and what a man was supposed to buy to prove both.
Ads began appearing in magazines featuring diamonds alongside romantic imagery, with copy that linked the size and quality of a diamond directly to the depth of a man's love and his seriousness about the relationship.
Diamonds started showing up in Hollywood films too, worn by movie stars in roles that quietly reinforced the same message playing out in the print ads.
The Slogan That Changed Everything
In 1947, a copywriter at N.W. Ayer named Frances Gerety wrote four words that would end up defining the diamond industry for the rest of the century.
A diamond is forever.
The line worked on more than one level. It was romantic, and it also solved a real business problem for De Beers.
If a diamond was truly forever, reselling one made little sense. That single idea discouraged a secondhand market from ever forming at scale, which meant no flood of used diamonds could come back onto the market and drag prices down.
Gerety spent decades writing copy for De Beers, and that slogan was later named the top advertising slogan of the twentieth century by Advertising Age. It still appears on De Beers marketing material today, more than seventy five years after she wrote it.
How Two Months of Salary Became an Unwritten Rule
The advertising did not stop at persuading people that a diamond was required. It went further, telling people exactly how much to spend.
Early De Beers ad campaigns suggested a man spend roughly a month's salary on an engagement ring. Later campaigns raised that figure to two months' salary, a number many people still repeat today as though it were an old custom rather than a decades old marketing suggestion.
There was no research behind that number, no financial logic, and no tradition predating the ad campaign that produced it. It was a figure chosen because it sounded reasonable enough to accept and large enough to keep sales growing.
The same playbook was exported internationally. Japan had little to no cultural tradition of diamond engagement rings before the 1960s. De Beers launched a targeted campaign there, and within roughly two decades, a diamond engagement ring had become the standard expectation for couples across the country.
It remains one of the most studied examples in marketing history of a company manufacturing a tradition from nothing and having an entire culture adopt it as though it had always existed.
What Actually Matters Once You Know the History
None of this means an engagement ring is meaningless, and it does not mean diamonds are a bad choice if that is genuinely what someone wants.
It does mean the specific rules many people feel pressured by, a diamond, a certain size, a certain number of months of income, were built by an advertising agency chasing a sales target, not handed down from any older tradition.
Once you know that, the pressure around the ring itself tends to loosen. Couples today are choosing colored stones, lab grown diamonds, vintage settings, and family heirlooms passed down through generations. Plenty are choosing no ring at all, at least not right away.
What survives from the actual old tradition, the version that existed long before any advertising agency got involved, is much simpler than a marketing department ever needed it to be. Two people making a promise to each other, and choosing something small to mark that the promise was made.
The ring was never really the point. It never was, even in 1477. The story behind it always was, and still is, whether that story gets told to a jeweler, a grandchild, or nobody at all.
Rings get passed down, but the stories behind them rarely do, at least not on their own.
How your grandmother's ring survived a move overseas, or why your grandfather saved for eight months instead of two, is usually a far better story than anything a jeweler could sell you.
Memoracy exists to make sure those stories get written down before they disappear along with the people who lived them.
Sign up and start your first story on Memoracy today.
