239 Diamonds Had to Match Before This $18 Million Watch Could Exist

The price is US$18 million, and the first thing to say about it is whose number it is. It is Jacob & Co.'s own — the maker's stated price for the original Billionaire, a unique piece launched at Baselworld in 2015 and restated in the house's 2023 history of the model. It is not an auction result. No second example exists to test it against a market, and this story does not pretend otherwise.

What the number bought is a count: 239 emerald-cut diamonds across the case, the crown and an integrated bracelet, on an 18-karat white gold structure roughly 47.5 mm across. Contemporary reporting puts the total near 260 carats. The stones sit so tightly, in the house's words, that they became sheer light. Even the crown is a diamond — a single polished cabochon. Underneath the jewellery is a hand-wound skeleton tourbillon, the calibre JCAM09, with a reported 72-hour reserve. It tells the hours and the minutes. That restraint is deliberate, and it is the honest core of the piece.

The hunt is the premium

One fine emerald-cut diamond is a purchase. Two hundred thirty-nine that can sit side by side as one continuous surface is a search. Emerald cuts show everything — the long step facets leave nowhere for a colour or clarity mismatch to hide — so every stone had to agree with its neighbours. The house states the band it worked to: white, internally flawless to VVS, G colour or better, no fluorescence. Jacob & Co. calls finding, sorting, cutting and preparing the 239 stones "an enterprise of incredible proportions," and the arithmetic backs the house up: the larger a matched set grows, the rarer each additional acceptable stone becomes, because it must match every stone already chosen.

The stones were not standard cuts dropped into standard settings, either. Each one was cut to its exact position in a tapering case-and-bracelet structure and set invisibly, the metalwork hidden, so the surface reads as solid diamond. A stone cut a fraction off was not adjusted. It was rejected, and the search resumed. There was no production line to spread that cost across: the design, the hunt, the cutting programme and the setting were all spent on one object, made as a bespoke project with Flavio Briatore's Billionaire Lifestyle operation over several years.

The owner who put his own number on it

In 2018 the watch changed hands by private purchase. Floyd Mayweather bought it, announced the purchase himself, and named his seller: the Japanese jeweller Tadashi Fukushima. Mayweather publicly put the same $18 million figure on the watch, so the maker's price travelled with the piece into its owner's own framing. That is the basis this story uses the number on — no stronger. There is no hammer record to confirm or correct it, and the watch's current whereabouts beyond Mayweather's ownership and public wear are not established.

The ordinary counterpart

The tourbillon — the one genuine watchmaking complication the Billionaire carries — can be bought from a mainstream Swiss house today. TAG Heuer's Carrera Chronograph Tourbillon Extreme Sport, 44 mm, lists at $39,350 on the maker's US site, in stock, with a COSC-certified movement and a chronograph the Billionaire does not have. The Billionaire's price is roughly 457 of those. Both watches regulate a balance wheel with a tourbillon and tell the time; the TAG Heuer is arguably the more capable instrument. The $17.96 million between them is not timekeeping. It is 239 matched diamonds, invisible setting, and a production run of one. A multiple like that describes expenditure. It does not measure quality, and it promises no return.

What the price includes — and what it does not

Included, as documented: the unique 2015 watch itself, and the commissioning — years of bespoke development spent on a single object. Not included, because it does not exist in print: any breakdown assigning a share of the $18 million to stones, setting labour or movement. And a boundary worth stating plainly: Billionaire II, Billionaire III, Billionaire Ashoka and Billionaire Timeless Treasure are later, separate watches with their own stone counts and prices. None of their figures — and none of their photographs — belong to this story.