TL;DR
Unearthed in South Africa in 1877 as a 287.42-carat rough stone, the Tiffany Diamond was cut to 128.54 carats in Paris under the young gemologist George Frederick Kunz, who sacrificed more than half its weight to make its yellow colour glow. In nearly 150 years it has never been sold — despite a famous one-day, $5 million offer in 1972 — and only four women have ever worn it, from Audrey Hepburn in 1961 to Beyoncé in 2021.
There are diamonds that change hands, and diamonds that change the room simply by being in it. The Tiffany Diamond belongs in the second group. It has spent most of its life behind glass in New York, emerging only a handful of times. It is, by Tiffany & Co.'s own description, one of the largest and most celebrated fancy yellow diamonds in the world. It is also, remarkably, a diamond that has never really been for sale.
A 287-Carat Rough Stone From the Kimberley Diamond Rush
The story begins in Kimberley, South Africa, in 1877, at the height of a diamond rush. A decade earlier, in 1867, Erasmus Jacobs had found the Eureka diamond near Hopetown, and by 1871 diamonds on the De Beers brothers' farm had drawn tens of thousands of prospectors to Colesberg Kopje, the hill dug out to become the Big Hole. The Big Hole at Kimberley was dug by hand to a depth of around 240 metres before the mine closed in 1914.
It was in this feverish landscape that a canary-yellow rough diamond weighing 287.42 carats was unearthed in 1877. Tiffany & Co.'s own timeline records that Charles Lewis Tiffany purchased the stone the following year, in 1878, and had it cut to 128.54 carats and named the Tiffany Diamond. The purchase price is widely reported as $18,000 — a considerable sum in 1878. Charles Tiffany, already nicknamed the "King of Diamonds," had bought the largest yellow diamond yet discovered.
Cut for Colour, Not for Size: George Frederick Kunz's Gamble
The rough stone was sent to Paris, to George Frederick Kunz. Kunz was just 23 and newly joined to Tiffany, already a collector who had amassed some 4,000 mineral specimens as a teenager. He studied the rough for a full year before cutting a single facet.
What Kunz produced was a cushion-shaped brilliant of 128.54 carats with 82 facets — 24 more than the 58 of a traditional brilliant cut. The extra facets were cut to deepen and hold the colour, so the stone seemed lit from within. The decision cost weight: over 55 percent of the rough was given up in cutting. As the house puts it, the diamond was "cut to 128.54 carats to enhance its brilliance rather than size," a symbol of pursuing beauty over size. The Tiffany Diamond was Kunz's first great test; he stayed at Tiffany for the rest of his working life.
Why Is It Yellow? Nitrogen, Trapped in the Crystal
A diamond is pure carbon in a tight crystal lattice. Colour arrives when something else is caught in that lattice as the crystal grows deep underground. In yellow diamonds, that something is usually nitrogen. As GIA researchers explain, nitrogen-related defects are responsible for the colour in nearly all natural yellow diamonds: the nitrogen absorbs blue light, and the light that reaches the eye reads as yellow.
The rarity lies in the combination. A faint yellow tint on the familiar D-to-Z colour scale actually lowers a diamond's value — it is warmth where colourlessness is prized. Only when the yellow grows strong enough to pass beyond Z does the scale flip: the stone leaves the colourless world altogether and enters the fancy-colour world, where saturation is everything. GIA grades fancy yellows from Fancy Light to Fancy Vivid, and the strongest, purest yellows — nicknamed "canary" in the trade, though GIA does not use the term on reports — are vanishingly uncommon at any size, let alone at 128 carats. Tiffany notes that only about one diamond in 10,000 qualifies as fancy colour at all.
Only Four Women Have Ever Worn It
For most of its life, the Tiffany Diamond has been a display piece — the centrepiece of Tiffany's exhibits at the world's fairs in Chicago in 1893 and New York in 1939–40, and a fixture of the Fifth Avenue flagship store. It was not worn until 1957, eighty years after it was found, when Mary Whitehouse — Mrs. E. Sheldon Whitehouse, chair of the Tiffany Ball in Newport, Rhode Island — wore it in a pendant of 20 diamonds from a rivière of 64 diamonds.
Four years later came the wearing that fixed the diamond in the public imagination. In 1961, Audrey Hepburn wore it in Jean Schlumberger's Ribbon Rosette necklace for the publicity photographs for Breakfast at Tiffany's. She did not wear it in the film itself; the photographs were enough, and they remain among the most reproduced jewellery images ever made.
Then, silence — for 58 years, no one wore it. It was exhibited, including at the Smithsonian's National Museum of Natural History in 2007 in Schlumberger's "Bird on a Rock" brooch setting. In 2012, for Tiffany's 175th anniversary, it was mounted in a necklace set with more than 100 carats of white diamonds — the necklace Lady Gaga wore to the 91st Academy Awards in 2019, the first time, Tiffany said, the stone had graced an awards-show red carpet. Beyoncé became the fourth wearer in 2021, in Tiffany's "About Love" campaign alongside Jay-Z — the first Black woman to wear the diamond. Four women in nearly a century and a half, kept short on purpose.
Five Designs, One Stone — and a 2,000-Hour Reimagining
Before 2023, the diamond had appeared in only four designs: the 1957 necklace, Schlumberger's 1961 Ribbon Rosette, the 1995 "Bird on a Rock" brooch for Schlumberger's Paris retrospective, and the 2012 anniversary necklace. The fifth arrived for the reopening of Tiffany's Fifth Avenue flagship, renamed The Landmark, in April 2023, when Nathalie Verdeille reimagined "Bird on a Rock" as a transformable brooch and pendant, with five diamond-encrusted birds circling the stone. The new setting took nearly 2,000 hours, Tiffany says — 1,220 round brilliant diamonds and 35 oval diamonds, more than 75 carats in total, plus 10 round pink sapphires, all set by hand. See the current design on Tiffany's own page for the diamond, where the house tells the story in its own words.
Why Are Fancy Yellow Diamonds So Expensive?
Yellow is paradoxically both the most common fancy colour and one of the hardest to find at the top end: most fancy yellows are small, lightly saturated, or brownish. What commands serious prices is a narrow intersection — strong, pure, even saturation, in a large, clean stone, with natural, untreated colour confirmed. Together, at 128 carats, they are close to unique.
That is also why the Tiffany Diamond's value is discussed in estimates rather than prices. In 1972, Tiffany ran a playful advertisement in The New York Times offering the unset stone for $5 million, good for 24 hours only. No buyer came forward. Press estimates around Lady Gaga's Oscars appearance put its value at roughly $30 million — best understood as a placeholder for "priceless," since a stone that has belonged to one house since 1878 and is not on the market has no price in any meaningful sense. At a more everyday scale, the same principles apply in miniature: saturation matters more than size alone, and a laboratory report confirming natural fancy colour is what separates a collector's stone from one that merely looks yellow.
A Diamond That Chose to Stay Put
Most famous diamonds have restless biographies: stolen, sold, recut, renamed, fought over by nations. The Tiffany Diamond's is almost serene — one mine, one buyer, one house, one city, with brief excursions to world's fairs, to Washington, and onto four famous necks. Its drama is quieter: a young gemologist studying a rough stone for a year, a jeweller giving up half a stone to save its colour, a house deciding again and again that some things are worth more kept than sold.
That is why it endures when flashier stones fade. It is not the largest diamond in the world, nor the most expensive, nor the oldest — simply the one that has never left home. You can read more about the stones and stories that shape how we think about gems at Lumière Gems, but the Tiffany Diamond itself still lives where it always has: in New York, behind glass, waiting for its next rare outing — and, most likely, taking its time.