Sizing
How to Measure
All sizes at Atelier Martis follow the EU sizing system: your EU size is the circumference of your finger in millimetres. Not the diameter. If you use a size chart based on diameter, your result will be wrong.
For thicker rings like the Noctua or Arma II, order 1–2 sizes larger than your normal size.
Method 01
Paper strip
No existing ring needed. Most accurate method.
- 01
Cut a strip
Cut a strip of paper roughly the width of the ring you want to wear, at least 10 cm long.
- 02
Wrap your finger
Wrap it comfortably around the finger where you will wear the ring. Not too tight, not too loose — as you would wear a ring.
- 03
Mark the overlap
Mark the point where the end of the strip meets the rest of the paper.
- 04
Measure in mm
Unroll the strip and measure from the start to your mark with a ruler. That measurement in millimetres is your EU size.
Repeat 2–3 times to confirm your measurement. Every millimetre counts.
Method 02
Ring Sizer App
Only if you already own a ring that fits well.
- 01
Download the app
Search for "Ring Sizer" by Jason Withers on the App Store or Google Play. It is free.
- 02
Set units correctly
Open the app and set the units to Millimetres and the measurement type to Circumference — not diameter.
- 03
Measure your ring
Place your existing ring flat on the screen over the circle shown. Use the slider to align the circle with the inner edges of your ring. Your EU size will appear.
Make sure the ring you measure is one that fits the correct finger — not just any ring you own.