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Case diameter
The width of the case, normally measured without the crown. It has the biggest effect on how large the dial appears.
Online buying guide
How to Choose the Right Watch
A watch should suit your wrist, your routine and the amount of maintenance you want. Start with fit, then choose the movement, materials and features that support how you will actually wear it.
Step 1
Get the fit right before comparing styles
Product photos can make every watch look similar in size. Millimetres are more reliable.
Lug-to-lug
The top-to-bottom distance between the lug tips. The lugs should generally sit within the width of your wrist rather than overhang it.
Case thickness
Thicker watches feel more substantial and may sit above a shirt cuff. Slim cases usually feel dressier and less top-heavy.
Strap and bracelet
Check the stated length, clasp type and lug width. Bracelets can often be resized; keep every removed link.
Wrist-size starting points
These are broad visual starting points, not strict sizing rules. A square case, open dial, narrow bezel or long lugs can make a watch wear larger than its listed diameter.
| Wrist circumference | Case-diameter starting point |
|---|---|
| Under 15 cm | About 28–36 mm |
| 15–17 cm | About 34–40 mm |
| 17–19 cm | About 38–44 mm |
| Over 19 cm | About 42–46 mm+ |
Step 2
Choose the movement that matches your routine
Quartz
Best for: accuracy, convenience and low maintenance.
- Battery powered
- Generally very accurate
- Ideal for a watch that can be picked up and worn immediately
Solar / light powered
Best for: quartz convenience with less frequent battery servicing.
- Charges from natural or artificial light
- Stores energy in a rechargeable cell
- Should not be left in darkness for long periods
Automatic / mechanical
Best for: traditional engineering and an enthusiast experience.
- Powered by motion or hand winding
- No conventional battery
- Usually less precise than quartz and may need periodic servicing
Step 3
Select features you will genuinely use
Everyday use
Clear dial, date display, durable crystal and a comfortable bracelet or strap.
Travel
GMT or world-time display, strong legibility and a secure clasp.
Timing
A chronograph adds stopwatch functions, but its sub-dials can make the dial visually busier.
Low-light reading
Look for luminous hands and markers. The amount and duration of lume vary between models.
Lightweight comfort
Titanium is lighter than stainless steel. Resin and fabric straps can also reduce weight.
Scratch resistance
Sapphire crystal is highly scratch resistant. Mineral crystal is common and can offer good impact resistance at a lower cost.
Bracelet or strap?
Metal bracelets are durable and can often be resized. Leather is dressier but should be kept away from water. Silicone, resin and fabric are practical for active use. Check the lug width if you plan to fit a replacement strap later.
Step 4
Read water resistance conservatively
An ATM rating is a laboratory pressure rating, not a literal promise that the watch can be used at the equivalent depth. Always follow the manufacturer’s instructions for the exact model.
| Typical rating | Practical interpretation |
|---|---|
| 3 ATM / 30 m | Accidental splashes and light rain. Not intended for swimming. |
| 5 ATM / 50 m | Everyday water exposure. Do not assume swimming suitability unless the manufacturer specifically permits it. |
| 10 ATM / 100 m | Commonly suitable for swimming and surface water activities when the watch is in good condition. |
| 20 ATM / 200 m+ | Higher water resistance. Diving use still depends on the model being specifically designed and approved for it. |
Water resistance is not permanent.
Gaskets age, impacts can affect seals and opening the case may change resistance. Keep the crown fully closed, do not operate pushers underwater unless the manufacturer allows it, avoid hot showers and consider pressure testing after a battery change or case opening.
Before ordering
Watch purchase checklist
- I compared case diameter and lug-to-lug measurements with a watch I know.
- The case thickness and weight suit how I plan to wear it.
- I understand whether the movement uses a battery, light or mechanical power.
- The strap or bracelet will fit, or it can be adjusted.
- The crystal, case and strap materials suit my routine.
- The water-resistance rating is appropriate for my intended use.
- I checked the included warranty, accessories and delivery details.
Common watch questions
Is case diameter the most important measurement?
It is useful, but lug-to-lug length often predicts wrist fit better. Two watches with the same case diameter can wear very differently because of their lugs, bezel and case shape.
Should an automatic watch always keep perfect time?
No. Mechanical watches normally gain or lose more time than quartz watches. The acceptable range depends on the movement and manufacturer specification.
Can I swim with a 5 ATM watch?
Do not assume so from the rating alone. Check the manufacturer’s instructions for that exact model and make sure the seals are in good condition.
Ready to compare?
Shop watches with the measurements that matter
Use the product specifications to compare size, movement, materials and water resistance before ordering.
Disclaimer
Unless otherwise stated, Cosmoshop NZ is not owned by or affiliated with the brands it sells. All trademarks and brand names shown on our pages are the property of their respective companies, which retain all rights.
For brands where we are authorised dealers, we offer the manufacturer’s warranty. Otherwise, our default 1-year CosmoCare warranty applies.