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Jacqueline Kot

When Swedish chemist Anders Gustaf Ekeberg discovered tantalum in 1802, little did he know that the metal would be widely used today in mobile phones, surgical equipment, aerospace components and watches. Classified as a transition metal in the periodic table, tantalum is a very dense and hard material with a high melting point. It also features a blue-grey sheen that is particularly appealing to luxury watchmakers and collectors.
“Tantalum is naturally a beautiful blue-grey. It is not a surface treatment, it is the natural colour of the metal,” says Robin Tallandier, one of the co-founders of boutique watchmaker Atelier Wen. “And the tone is alive: it shifts subtly with ambient lighting, so the watch feels dynamic and never quite the same twice. There is nothing comparable in nature, which makes it genuinely unique.”

As a high-density metal, tantalum literally carries considerable weight. Tallandier points out that the metal sits between 18k gold and platinum in density, so “if you love watches with real wrist presence, it is hard to beat”.
Jackie Ho is an avid collector and founder of Watch Ho & Co, a community that he built for fellow watch enthusiasts. He explains tantalum’s particular appeal for him. “It comes back to what draws me to independent watchmaking in general; the idea that every choice a maker produces is intentional and that a piece rewards you the more attention you give it,” he says. “Tantalum fits that perfectly.”
Ho says that as collectors’ knowledge grows and they move beyond chasing luxury logos and turn their attention instead to the materials, finishing and craft behind high horology, “tantalum offers a lot to appreciate”.

“It’s quiet, but it’s serious. That combination is increasingly what I and many collectors I know are looking for,” he says.
Intriguing as the metal is, tantalum hasn’t reached mainstream material status in the watchmaking world – in part because it is extremely hard to work with. “Tantalum is notoriously difficult to machine,” says Ho. “It’s extremely ductile and tends to gall and work-harden during cutting, which means tooling wears quickly and tolerances are hard to hold.”
Galling is when some of the metal being used in watchmaking breaks off and transfers instead to another metallic surface, such as the cutting tool. “Tantalum chips do not break: they elongate and weld themselves directly to the cutting edge, forming what machinists call a built-up edge,” Tallandier explains. “This destroys both the tool and the surface finish almost instantly. Operators have to use very slow cutting speeds, specific feed rates, dedicated tool geometries and frequent tool changes just to keep the cut clean.”

Tallandier adds that the finishing process for a watch made with tantalum is equally challenging. “Achieving a deep, mirror-like polish, or a regular straight-grained brushing, on a tantalum component requires entirely dedicated processes, custom abrasives and an enormous amount of trial and error,” he explains.
Of course, the very challenges of working the material make a tantalum watch a rare and exclusive piece – one that comes with a price to match.
“It is arguably the single most challenging metal to work with, which is why almost no one uses it,” says Tallandier. “Collectors recognise that, and they appreciate the technical achievement behind a tantalum piece. They like knowing it is, in a way, the final boss of horological materials.”
An interesting point for Tallandier is how tantalum is often the metal of choice when a brand wants to create a stand-out piece, “a confidential, high-end micro-series sitting at the top of its range, often with serious horological content behind it,” he says.
Brands like Audemars Piguet, Jaeger LeCoultre, Hublot and Panerai have historically used this metal, but it is only in recent years that independent makers like Atelier Wen (who released three versions of the Inflection in 2025 with a tantalum case and integrated bracelet) and Fleming have released pieces (Series 1 Mark I and II) in this material. They were followed at this year’s Watches and Wonders by several other brands, including H. Moser & Cie, with its Endeavour Perpetual Calendar Concept Tantalum, and Zenith.

“The most recent and telling example is Zenith’s GFJ in tantalum, which was released during Watches and Wonders in very small volume at a high price point,” Tallendier says. “Tantalum has become a kind of signal in itself: when you see it, you know the maker is making a statement about the importance of that piece.”
Ho observes that the increased use of tantalum today among independent watch brands – including US-based Fleming and Malaysian brand Ming – comes with more thought and consideration.
“These brands seem to be genuinely asking what tantalum wants to be, what case shapes and surface treatments best express its particular nature,” he says. “The material feels like it was part of the design conversation from the beginning, not an afterthought. That’s a meaningful shift and it’s the kind of thing that gets collectors excited – when you can sense the thought process.”
Ho wants to see tantalum become a permanent addition to a brand’s portfolio of materials, instead of only being used for special editions. He would also like independent watchmakers to explore ways to use tantalum in a watch dial.
“At its best, a watch is a conversation between all its elements and tantalum’s particular character – that quietness, that weight, that colour – opens up some really interesting possibilities for makers who are willing to sit with it and think deeply,” says Ho.
“That’s the kind of watchmaking I get most excited about and I think there’s still a lot left to explore.”


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Why tantalum is the ‘final boss’ of watchmaking materials

Atelier Wen Inflection with fumé enamel green dial and hand-hammered silver dial base. Photo: Handout

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The Inflection from Atelier Wen, with a blue grand feu enamel dial. Photo: Handout

Fleming Series 1 Mark II Redwood in red gold (above) and Pacific in tantalum. Photo: Handout

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Piaget Sixtie. Photo: Handout

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Watches

Notoriously difficult to work with, the blue-grey metal is nevertheless appealing to independent horologists like H. Moser & Cie, Atelier Wen, Fleming and Ming


Notoriously difficult to work with, the blue-grey metal is nevertheless appealing to independent horologists like H. Moser & Cie, Atelier Wen, Fleming and Ming.


Why tantalum is the ‘final boss’ of watchmaking materials

.css-1c6uqr6{color:inherit;font-weight:inherit;font-size:inherit;font-family:inherit;line-height:inherit;overflow-wrap:break-word;}Notoriously difficult to work with, the blue-grey metal is nevertheless appealing to independent horologists like H. Moser & Cie, Atelier Wen, Fleming and Ming

Notoriously difficult to work with, the blue-grey metal is nevertheless appealing to independent horologists like H. Moser & Cie, Atelier Wen, Fleming and Ming