A good watch is one whose verified performance, construction, water resistance, features and ownership support fit the way you plan to use it. Price, prestige and movement type alone do not establish quality. Start with your intended use, then compare claims you can check—and weigh comfort, legibility and style according to your own priorities.
Start with what you need the watch to do
Set the use case before comparing specifications. A watch for office wear has different demands from one for swimming, scuba diving or frequent travel. The relevant standards distinguish watches intended for daily use and swimming from watches intended for scuba diving: ISO’s 2010 explanation of watch water-resistance standards.
- Everyday wear: Prioritize a comfortable fit, readable dial and features you will use routinely.
- Swimming: Check that the manufacturer identifies the watch as suitable for swimming and follow its instructions for use and care.
- Scuba diving: Look for an explicitly stated diving capability and relevant certification or standard, rather than relying on a depth marking alone.
- Travel or collecting: Consider useful functions, service access and documentation alongside appearance and personal value.
These are decision criteria, not a universal score. A watch can be well suited to one activity and a poor choice for another.
Check accuracy claims in context
A daily rate is the difference between two time readings separated by 24 hours. If a maker gives an accuracy figure, check what kind of watch it applies to, how it was evaluated and whether the test conditions or classification are documented.
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Quartz accuracy
ISO 10553:2018 specifies procedures for evaluating the accuracy of quartz watches, individually or by lots, and relates tested accuracy to the manufacturer’s accuracy classification. ISO says the standard applies to quartz watches accompanied by documents that state an accuracy classification. The edition was confirmed in 2024 and remains current according to ISO. It does not apply to mechanical watches.
Mechanical accuracy and chronometer claims
ISO’s horological vocabulary defines a chronometer as a precision timekeeping instrument regulated for various conditions of use, approved by an impartial official body and supported by an individual attestation. The word is most useful when you can identify the certifying body, test and documentation—not as a stand-alone adjective. See ISO’s horological vocabulary.
Certification can provide evidence about defined tests, but it is not a complete score for overall quality. Ask whether testing covers the movement alone or the finished, cased watch, and which criteria were assessed.
A dated example: COSC’s announced additional level
On 12 March 2026, the Federation of the Swiss Watch Industry reported that COSC had announced an additional “Excellence Chronometer Certified” level. According to that report, the process includes 15 days of movement testing followed by five days of cased-watch evaluation. In the stated cased-watch test, rate deviation must fall between -2 and +4 seconds per day; the watch is tested against a 200 Gauss magnetic field, and its power reserve is checked against the maker’s announced figure. The report also says every watch bearing this certification is tested, rather than sampled. These figures describe COSC’s certification process, not typical watch performance. The report said brands could enter the process from October 2026 and expected the first watches to arrive then; that dated announcement does not establish certification or availability for any particular model today. Read the Federation of the Swiss Watch Industry’s 12 March 2026 report for the announced scope.
Match water resistance to the activity
A water-resistance number or marking is not, on its own, a guarantee that a watch suits every water activity. ISO’s 2010 explainer says ISO 22810 covers watches intended for daily use and swimming, while ISO 6425 covers watches that can be used for scuba diving. It gives a 30-metre marking as an example and describes the case as needing not to leak at that depth under the standard’s conditions. That example is not a promise that every watch marked 30 metres is suitable for every activity or can safely be used at that real-world depth.
Check the specific manufacturer’s instructions for the watch. For example, Casio’s water-resistance guidance advises against operating the crown or buttons while a watch is submerged or wet, and cautions about heat, baths and detergents in the circumstances it lists. Casio gives general gasket-replacement guidance of about once every two or three years, and once every two years for the 200-metre diver’s watches described on that page. Those are Casio recommendations, not universal service intervals; consult the instructions for your own watch.
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Assess fit, construction and everyday usability
Specifications cannot tell you whether a watch works well for your wrist and routine. If possible, try it on and check that it sits comfortably, stays secure and is easy to read at a glance. Consider whether the controls are practical and whether the case and strap feel appropriate for your intended use.
- Legibility: Can you read the time quickly in the conditions where you expect to wear it?
- Fit: Does the case and strap feel comfortable during ordinary wear?
- Controls and features: Are the crown, buttons and functions useful and straightforward for you?
- Construction claims: Compare documented specifications and maker guidance; do not infer quality from weight, jewel count, country of origin or prestige alone.
Quartz and mechanical movements involve different preferences and trade-offs. Compare the stated performance, upkeep and features that matter to you; neither movement type is automatically the better watch for every buyer.
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Check warranty, service and care before buying
Ownership support affects whether a watch remains suitable over time. Find the warranty terms for the exact brand and model, whether the seller is an authorized channel, and what service routes the manufacturer documents. A certificate or warranty matters only within its stated scope and conditions.
Rolex, for example, says its guarantee depends on conditions including purchase from an Official Rolex Jeweler and a completed guarantee card. It recommends periodic professional servicing to help maintain accuracy and waterproofness, currently giving approximately every 10 years depending on model and real-life use. These terms and timing apply to Rolex watches, not to watches generally. See Rolex’s watch-care and service FAQ.
Compare two watches on the same terms
When choosing between candidates, compare evidence in matching categories instead of treating one impressive specification as decisive.
| What to compare | Questions to ask |
|---|---|
| Movement and accuracy | Is it quartz or mechanical? What accuracy claim or classification is documented, and what was tested? |
| Intended environment | Does the maker identify it for ordinary use, swimming or scuba diving? What usage and maintenance instructions apply? |
| Certification | Who issued it, which criteria were tested, and did testing cover the movement or the cased watch? |
| Daily usability | Is it comfortable, legible and practical for your activities? |
| Ownership support | What are the warranty conditions, documented service routes and care requirements? |
| Personal value | Does the price make sense to you given the documented features, support and design you prefer? |
There is no universal brand ranking or movement ranking that settles the choice. Nor does a higher price by itself establish better performance. The strongest comparison is between specific watches, using claims and policies that you can verify for each one.
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