From Ancient Rome to Lab-Grown: The Real History of the Diamond Engagement Ring

The history of diamond engagement rings is far shorter, and far stranger, than most of us assume. Betrothal rings themselves are at least two thousand years old — Roman brides wore them long before anyone thought to set a stone in one — but the first recorded diamond engagement ring only appeared in 1477, and the idea that a proposal requires a diamond was largely manufactured by a single advertising campaign in 1947. Knowing that history does not make the ring on your finger any less meaningful. If anything, it makes the tradition more human: a story of borrowed myths, political marriages, a teenager on a riverbank, four words scribbled late at night — and now, a new kind of diamond grown rather than mined.

Rome, and the vein that never existed

The Romans gave us the engagement ring itself. A betrothed woman received an anulus pronubus — a plain band worn as a public pledge that a marriage contract existed. Pliny the Elder, writing in the first century AD, noted that this ring was traditionally iron and set with no gem at all; by the second century, those who could afford gold generally chose it. Some Roman rings carried the fede motif — two clasped right hands — which still turns up in Irish Claddagh rings today.

The Romans also helped spread the tradition's loveliest piece of nonsense: the vena amoris, or "vein of love", said to run directly from the fourth finger of the left hand to the heart. The idea is usually traced to ancient Egypt, and the late-Roman writer Macrobius passed it along — though oddly, the Latin phrase itself cannot be found in print before the seventeenth century. Anatomically, it is simply untrue: the veins in every finger follow much the same route, and none has a private line to the heart. It does not matter. Two millennia on, most of the Western world still wears its rings on that finger, loyal to a vein that never existed. Some myths are worth keeping.

1477: a nervous archduke and the first diamond ring

The diamond enters the story in August 1477, when Archduke Maximilian of Austria — the future Holy Roman Emperor — married Mary of Burgundy, one of the wealthiest heiresses in Europe. According to most accounts, Maximilian presented her with a gold ring set with slivers of diamond, reportedly arranged in the shape of the letter M. It is the first documented diamond engagement ring in history.

We should be honest about the romance here: this was as much a political transaction as a love match, a union that pulled the rich Burgundian territories into the Habsburg orbit and reshaped the map of Europe. Yet contemporaries record that the young couple genuinely grew fond of one another, and when Mary died after a riding accident in 1482, aged just twenty-five, Maximilian is said to have mourned her for the rest of his life. The precedent was set, though only for a tiny elite — diamonds were then so rare that a diamond ring remained a royal gesture, not a popular custom, for centuries.

Whispered poems, interlocking bands and Victorian serpents

For most people between the Renaissance and the nineteenth century, betrothal jewellery was about words and symbols rather than stones. The posy ring — a gold band engraved with a short rhyme or motto — was the workhorse of English and French courtship from roughly the fourteenth to the seventeenth century. Early inscriptions ran around the outside; over time they migrated to the inside of the band, so the promise sat privately against the skin. Museum collections preserve hundreds of them, engraved with vows of constancy that only the wearer could read.

The gimmel ring was cleverer still: two or three interlocking hoops, sometimes worn separately by bride and groom during the engagement, then reunited into a single ring at the wedding. Renaissance examples often hid tiny sculpted details — clasped hands, hearts, even memento mori figures — inside the joined bands.

The Victorians turned sentimental jewellery into an art form. Queen Victoria's own engagement ring from Prince Albert in 1839 — designed by Albert himself — was a gold serpent set with an emerald, her birthstone, the snake being a Victorian symbol of eternal love. Acrostic rings spelled out words like "REGARD" in the first letters of their gemstones. Diamonds appeared more often as the century wore on, but they were still one option among many. Nothing yet said a proposal needed one.

1867: a boy, a riverbank and a monopoly

What changed everything was geology. In 1867, a fifteen-year-old farm boy named Erasmus Jacobs picked up a pretty pebble on the banks of the Orange River near Hopetown, South Africa. It turned out to be a 21.25-carat diamond, later named the Eureka. Within a few years, the discoveries around what became Kimberley had triggered one of history's great mineral rushes, and diamonds — for a thousand years among the rarest objects on earth — suddenly existed in industrial quantities.

Abundance, of course, is a problem if your product's value rests on scarcity. In 1888, Cecil Rhodes and Barney Barnato merged their competing operations into De Beers Consolidated Mines, and within a few years the company reportedly controlled around ninety per cent of the world's diamond production. Supply could now be managed. The next challenge was demand — and demand had collapsed. During the Great Depression, diamond prices slumped, and the average American engagement ring, where one existed at all, held no diamond whatsoever.

Four words that manufactured a tradition

Here is the part of the story the jewellery industry told quietly for decades, and which we would rather tell you plainly. In 1938, De Beers hired the Philadelphia advertising agency N.W. Ayer & Son with an unusual brief: not to sell a brand, but to invent a custom — to persuade ordinary couples that love itself required a diamond. In 1947, a young Ayer copywriter named Frances Gerety, working late on the account, scribbled down four words before going to bed: A Diamond Is Forever. Advertising Age would later name it the greatest slogan of the twentieth century. Gerety, who wrote the most successful proposal in commercial history, never married.

The campaign worked almost frighteningly well. Ayer's advertising seeded films with proposal scenes, lent stones to celebrities and, crucially, invented the "salary rule" — first suggesting a month's wages was the proper price of devotion, later escalating to two months in 1980s America. That rule was never tradition, etiquette or economics. It was ad copy, engineered to rise. By one widely cited estimate, around ten per cent of American brides received diamond engagement rings in 1940; by 1990 the figure was roughly eighty per cent. The "timeless tradition" most of us inherited is younger than the ballpoint pen.

The lab-grown chapter: same symbol, grown stone

Which brings the story to its latest reinvention. Gem-quality lab-grown diamonds became commercially viable in the mid-2010s, and in 2018 the US Federal Trade Commission removed the word "natural" from its definition of a diamond — formal recognition that a diamond grown above ground is chemically, physically and optically the same stone as one mined from beneath it. Adoption since then has been remarkably swift: by 2024, US wedding surveys reported that more than half of new engagement rings held a lab-grown centre stone. If you are curious about the science, we have written about how lab-grown diamonds are made, and about how grown and mined stones truly compare.

Seen against two thousand years of history, this feels less like a rupture than a rhyme. The ring has already survived every reinvention thrown at it — iron to gold, poem to gemstone, royal gesture to universal custom. The symbol was never really the stone; it was the promise. Couples choosing a grown diamond today are doing what couples have always done: keeping the meaning and updating the material.

At Signora, that is the chapter we belong to. Every ring we make is made to order in Surat, India, set with a lab-grown diamond certified by IGI, its report number laser-inscribed on the girdle — and we will happily tell you exactly where your stone came from, because this time the story holds up. If you would like to see where the tradition goes next, our engagement ring collection is a quiet place to start.