Imagine spending 12,000 euros on a scratch-proof watch, only to drop it and watch it shatter into pieces. Welcome to the world of ceramics. This material has taken over the display cases of major brands, from Tudor to Omega, Hublot, and Rado, and is considered the Holy Grail by many enthusiasts. But it's not really for everyone. We're going to break down how to transform powder into an ultra-hard case, why Rolex struggled so much with its Pepsi bezel while Hublot effortlessly produced bright red, and most importantly, give you all the keys to decide whether or not a ceramic watch is right for you.
Ceramic in watchmaking is not porcelain
First thing to clarify: when we talk about ceramic in watchmaking, you need to completely forget the image of your grandmother's porcelain or a terracotta vase. It's not at all the same thing, even if firing remains a common point. We're talking here about advanced technical ceramic, a non-metallic inorganic solid in a category all its own.
The absolute star of this family, used by Omega, IWC, Rolex, and most major brands for their cases and bezels, is zirconium oxide ZrO2. Originally, it's an ultra-fine white powder, finer than flour. This powder is an oxide of a metal, zirconium, which makes it chemically inert: it can no longer oxidize since it is already fully oxidized. It's like ash; you can't burn ash because it's already burned. Ceramic achieves perfect chemical stability.
How a ceramic case is made
The manufacturing of a ceramic case is a complex and costly industrial process, which is why ceramic is expensive, much more due to the process than the raw material itself.
We start by mixing zirconium oxide powder with an organic binder, a kind of polymer-based glue, to allow the powder to be molded. It's also at this stage that color pigments are added. This is where everything comes together for the final hue.
Then, the paste is injected into a mold under high pressure, exactly like for injection-molded plastic parts. At this stage, the case has its shape but is extremely fragile, with the consistency of chalk. You could crush it with your fingers.
Before firing, the organic binder must be removed in a low-temperature oven or a chemical bath. If this is not done, the gases produced during firing would cause the piece to explode.
Then comes sintering, the actual firing. The fragile cases are placed in an oven between 1400 and 1500 degrees Celsius, sometimes over 2000 degrees depending on the brand. The powder grains fuse at the atomic level. The material becomes ultra-compact.
This is where the most critical challenge arises: by densifying during firing, the case shrinks by 25 to 30% of its volume. To obtain a 42 mm case at the end, it must initially be molded at approximately 50 mm. And the shrinkage is not uniform everywhere. The lugs can shrink differently from the rest of the case. A miscalculation and the movement no longer fits, the case back no longer screws on, and water resistance is impossible.
Once fired, the piece is extremely hard, and it can no longer be filed or cut with conventional steel tools. For finishing, to polish angles or brush surfaces, diamond tools must be used. This is what drives up production costs, and it is why every ceramic case that arrives in stores has survived a challenging journey.
The real advantages of ceramic
Scratch resistance is the number one argument. Zirconium oxide reaches between 1200 and 1400 HV, which is six to seven times harder than 316L stainless steel at 190 HV. In concrete terms, nothing you encounter daily can scratch your watch. This is a true promise kept.
UV resistance is another major advantage that is often overlooked. Old Rolex watches with anodized aluminum bezels discolored over time because the aluminum pigments were not UV-resistant. Ceramic is chemically inert: buy a blue ceramic watch today, and in 50 or 100 years, it will have the exact same blue, the same density, and the same luster. It will never tarnish.
It also doesn't oxidize. You can leave it in seawater for years, take it out, wipe it off, and it will be spotless.
For comfort, ceramic is a poor conductor of heat. Unlike steel, which draws heat from your wrist in winter and feels cold, ceramic balances with your skin temperature. Consistent wearing comfort regardless of the season.
It's also 100% hypoallergenic. No nickel, no chromium, no chemical reaction with sweat acidity. For those with sensitive skin or who react to metals, it's the ideal solution.
Finally, the density of zirconium oxide is approximately 6 g per cm3, compared to 8 g for steel. The watch is therefore lighter than its steel equivalent while being more scratch-resistant.
The flaw that changes everything: fragility to impact
In materials physics, there's a very simple rule: the harder it is, the more brittle it is. This is the fundamental and irreducible compromise between hardness and toughness. Steel hits a wall, absorbing energy by deforming slightly. It's ugly, but the structure holds, the watch remains waterproof, and the movement is protected. Ceramic does not deform. When it receives an impact, the energy has nowhere to go, and it shatters cleanly.
There are many cases of ceramic watches from very big brands that break at the slightest impact. Most of the time by falling to the ground, but sometimes also by hitting something while the watch is still on the wrist. And that's more problematic because it can happen to anyone, even if they're being careful.
If you damage a steel case, it can always be repaired. If you break a ceramic case, it's over. The entire case must be replaced. For high-end watches, this automatically costs several thousand euros for such an intervention.
What major brands are doing with ceramic
Rado was one of the very first brands to make ceramic watches, and they have remarkable technology they call high-tech plasma ceramic. They take already fired white ceramic and put it back into a special oven at 20,000 degrees with specific gases. The gases penetrate the surface and change the molecular structure, giving it a truly metallic appearance. If you want to test a very good ceramic watch without paying Omega prices, Rado probably offers the best value-for-technology on the market for this material.
Omega primarily uses zirconium oxide ZrO2 for its Moonwatch. For certain specific models like the Seamaster Great White Side of the Moon, they use silicon nitride Si3N4, an even more technical ceramic, grayer, lighter, and especially with better shock resistance than standard zirconium.
Hublot is often mentioned, and they are truly serious about research and development. They are the only brand to have successfully produced bright red or bright yellow ceramic for an entire watch case on an industrial scale. Normally, to achieve red, unstable organic pigments are used which burn at 1500 degrees during firing and turn brown or grayish. Hublot has patented a special sintering method that combines pressure and heat to densify the ceramic without burning the pigments. The resulting red ceramic is even harder than standard black, at 1500 HV versus 1200.
Rolex is very conservative on this subject and does not have an entirely ceramic watch. They use ceramic only for bezel inserts, which they call Cerachrom. But making a bi-color bezel from a single block of ceramic is an enormous technical challenge. You cannot glue two different pieces of ceramic together; it would break immediately. Rolex has developed a secret chemical process: they manufacture an entirely red but porous bezel, not fully fired. Then they chemically impregnate half with a cobalt salt solution. Then they fire the whole thing: the red part remains red, the impregnated part reacts to the heat and turns blue. The first versions had pastel colors that were a bit faded. They have improved, and the current versions are much closer to the original aluminum colors.
Tudor has released the Black Bay Ceramic, a sporty full ceramic diver at a relatively accessible price. However, Tudor ceramics have a history of breakage that Rolex has not overlooked, which explains why the parent company remains cautious on the subject.
Swatch Bioceramic: Not to be confused with true ceramic
The Moon Swatch popularized the term bioceramic, and many buyers believed they were getting a watch with the properties of true technical ceramic. This is not the case.
Swatch bioceramic is a composite: two levels of ceramic powder and one level of bio-sourced plastic derived from castor oil. Concretely, it's ceramic powder embedded in plastic glue. To the touch, it feels like plastic and it scratches. It's a nice material for making complex shapes and fun colors at low cost, and the Moon Swatch is an endearing watch for what it is. But technically, it has nothing to do with true sintered ceramic. Don't buy a Moon Swatch thinking you'll get the properties of a technical ceramic watch.
How to wear a ceramic watch without breaking it
If you've decided to take the plunge despite the fragility, here are the basic reflexes. The most dangerous moment for your ceramic watch is not when you're wearing it, but when you put it on or take it off. This is when it's most likely to fall. Always do it over a soft surface—a bed, a sofa, a towel placed on a table—never over tiles or a hard floor.
Then be vigilant about door handles, desk corners, and seatbelts. An impact on a hard surface can be enough to break the case even when the watch is on your wrist. This is not an exaggeration; it has happened to very careful owners.
For a ceramic watch over 5,000 euros, an extended warranty or valuable item insurance is a reasonable expense compared to the cost of replacing the case.
Who a ceramic watch is really for
Ceramic is for you if you're a perfectionist and can't stand to see your watch age or scratch. If you want a colorful watch whose shade will remain identical in 20, 50, or 100 years. If you have metal allergies. If you wear the watch primarily in the office or for evening events in low-risk contexts. And if you have the budget to cover a several-thousand-euro case replacement in case of impact.
Ceramic, however, is a bad idea if you are clumsy, if your watch often falls off your bedside table. If you are looking for a watch for DIY, motorcycling, or contact sports. If you cannot afford to replace the entire case if it breaks. And if you like to be able to repolish your watch as it ages, which is impossible with ceramic.
Key takeaways
Technical ceramic is an exceptional material in what it does well: almost absolute scratch resistance, color stability for centuries to come, hypoallergenic and thermal comfort. On these criteria, nothing equals it.
But it does one thing very well and one thing very poorly. What it does very poorly, breaking at the first serious impact without possibility of repair, is prohibitive for an active person. This is the fundamental compromise between qualities and toughness, and no current technology can completely eliminate it.
If you are looking for the best ceramic at a reasonable price, Rado is probably the reference with its plasma technology. If you want a full ceramic sports watch, Tudor Black Bay Ceramic or Omega Moonwatch are good options, being fully aware of the risks. If you like the Moon Swatch look, buy it for what it is, a fun and colorful watch, not for its alleged ceramic properties. And if you are really undecided, stick with stainless steel or grade 5 titanium: less glamorous on paper, infinitely more forgiving in everyday life.
For straps compatible with your ceramic and steel watches, find options on Braxen, straps guaranteed for life in metal, NATO, and rubber for most 20mm watches.
