Do Magnets Affect Rolex Timekeeping?
Rolex watches are some of the most well-made and reliable Swiss watches. They are built to withstand water, pressure, and even temperature changes. However, there is one weakness that some Rolex watches have: magnets.
Both everyday magnets and electromagnets have the ability to mess with the inner workings of your Rolex.
In this blog, we will break down how your Rolex is affected by magnets, what Rolex has done about it, and what to do if your Rolex watch becomes magnetized.
Simply, yes, strong magnets can have a negative impact on your Rolex watch’s performance.
The inner workings of some Rolex watch models are made of metal alloys that, naturally, can be pulled or pushed by a magnet.
Especially sensitive to magnetization is the watch’s balance spring, which can stick together or shorten its effective length. This will cause your watch to either run too fast or run irregularly. A badly magnetized watch can gain several minutes a day.
An especially strong magnet could even cause the inner escapement of your watch to lock up and stop the watch completely from functioning.
The good news is that magnetization is not damage. Nothing is broken and nothing is worn out. The steel parts have simply picked up a magnetic charge, and that charge can be removed.
Vintage Rolex watches are the most sensitive, as they use ferromagnetic Nivarox-type hairsprings and lack the modern technology to combat magnetic fields. Current Rolex calibers are far more resistant, but resistant is not the same as immune, and magnets found in everyday objects can still affect them.
The short version
Magnets do not break a Rolex. They disturb the balance spring, and a watchmaker reverses it in minutes.
- A magnetized watch usually runs fast or erratically, and in extreme cases stops.
- Vintage and older Rolex movements are the most vulnerable.
- Parachrom, Syloxi, and Chronergy components make current Rolex calibers highly resistant.
- The Milgauss is the only Rolex built with a soft iron shield, rated to 1,000 gauss.
- The catch: no mechanical watch is fully immune, and a strong enough field will still get through.
Rolex Anti-Magnetization Technology
The hairsprings, escapements, and shields Rolex uses against magnetic fields.
Rolex has created new technology to make their watches resistant to magnetism.
Introduced in 2005, Rolex created the blue Parachrom hairspring (also known as the “Parachrom Bleu”) which is made of a niobium-zirconium alloy with an oxide surface layer. Rolex has said that this hairspring is both shock resistant and insensitive to magnetic fields.
Introduced in 2015, the Caliber 3235 and 3255 both use a lever escapement made of nickel-phosphorus. Known as a Chronergy escapement, it is non-ferrous, so a magnet has nothing to pull on.
The Rolex Land-Dweller uses caliber 7135, which features a silicon Dynapulse escapement and a ceramic balance staff with a strong resistance to magnets. Rolex is moving this technology into future models.
| Technology | Introduced | What it does |
|---|---|---|
| Blue Parachrom hairspring | 2005 | Niobium-zirconium alloy hairspring, insensitive to magnetic fields |
| Syloxi hairspring | 2014 | Silicon hairspring, non-magnetic, used in smaller calibers |
| Chronergy escapement | 2015 | Nickel-phosphorus lever and escape wheel, non-ferrous |
| Dynapulse escapement, cal. 7135 | 2025 | Silicon escapement and ceramic balance staff in the Land-Dweller |
| Soft iron shield, Milgauss | 1956 | Faraday cage around the movement, rated to 1,000 gauss |
Resistance figures describe how much field a movement tolerates, not total immunity.
The Rolex Milgauss
One Rolex model, the Rolex Milgauss, was designed specifically for scientists working near particle accelerators and medical equipment. It houses the movement inside a soft iron faraday cage, which redirects magnetic fields around the movement rather than through it, and it is rated to withstand 1,000 gauss. The name says as much: mille gauss, a thousand gauss.
That rating is the highest protection Rolex has ever built into a watch, and it is far beyond anything you will meet in daily life. It is still a rating rather than a guarantee, and a field stronger than 1,000 gauss will get through. The shield is also exclusive to the Milgauss, which Rolex discontinued in 2023, so the only way to buy one now is pre-owned.
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Everyday Objects That Magnetize a Watch
Where the magnets actually are, and how close is too close.
Most magnetized watches are not magnetized by anything dramatic. They pick it up at home or at a desk.
The usual culprits are magnetic phone mounts and wireless charging pads, the magnets in a laptop lid and in tablet covers, speakers and headphones, magnetic handbag and jewellery clasps, refrigerator magnets, and the magnetic catch on a watch box or travel roll.
Distance matters more than strength. A field falls away sharply over a few centimetres, so a phone in the same pocket as a watch is a real risk, while a speaker across the room is not. The common failure is leaving a watch resting on a laptop, a charging pad, or a handbag clasp overnight.
Medical imaging is a separate case. An MRI room produces a field far beyond what any watch is built for, which is why watches are removed before you go in.
Worth knowing
Running fast is the classic sign of magnetism, but it is not the only cause. A knock, a worn mainspring, or a service that is overdue can produce the same symptom. If demagnetizing does not fix the timekeeping, the watch needs a bench check.
Can You Fix a Rolex That Has Been Magnetized?
How to check for magnetization at home, and who should carry out the fix.
If you have noticed the signs that your Rolex appears to be magnetized, running fast or erratically, you can check at home using a compass.
Hold a compass next to your Rolex and move the watch slowly past it. If the needle deviates by a few degrees or tracks the watch, your watch has become magnetic.
Demagnetizing your Rolex watch is relatively easy. You bring it to a professional watchmaker, who passes it through a demagnetizer. The job takes a minute or two and it is one of the least expensive things a watchmaker does.
After that, the watch should be checked on a timing machine to confirm the rate has returned to normal. If it has not, the problem was never the magnet.
If you believe your watch has become magnetized or is not running properly, we do recommend taking your watch to a professional rather than experimenting with magnets or tools at home.
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Rolex and Magnets FAQ
Can a magnet permanently damage a Rolex?
No. Magnetization changes how the watch runs, not what it is made of. The parts pick up a magnetic charge, and a watchmaker removes that charge with a demagnetizer. Nothing is worn out or broken by the field itself.
How do I know if my Rolex is magnetized?
The watch runs fast, often by minutes a day rather than seconds, or the rate jumps around. Hold a compass beside the watch and move it slowly past. If the needle deviates or follows the watch, it is magnetized.
Are modern Rolex watches anti-magnetic?
Current Rolex calibers are highly resistant rather than anti-magnetic. Parachrom and Syloxi hairsprings and the nickel-phosphorus Chronergy escapement give a magnet very little to act on, but only the Milgauss was built with a shield, and no mechanical watch is immune to a strong enough field.
Is the Rolex Milgauss still being made?
No. Rolex discontinued the Milgauss in 2023. It remains the only Rolex built around a soft iron faraday cage rated to 1,000 gauss, and it is now only available pre-owned.
Will my phone magnetize my Rolex?
It can if the two sit against each other. The speaker and the magnet array used for wireless charging are strong enough at close range. Keeping a phone and a watch in the same pocket, or resting the watch on a charging pad, is the usual way it happens.
How much does it cost to demagnetize a Rolex?
Very little. The tool costs a watchmaker almost nothing to run and the job takes a minute or two, so many charge a small bench fee or fold it into a timing check. Expect a service quote only if the rate is still off afterwards.
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