Find your size
Choose your Ex Sidere size from 1 to 12. The table shows the corresponding Cartier size and measurements. Ex Sidere size 7 corresponds to Cartier 60.
Before you order
- Start with a ring that fits the finger you intend to wear it on, or ask a jeweler to measure that finger with a ring sizer.
- Compare with a ring of similar width: width and inner profile change how a ring feels.
- If you are between sizes or unsure about the fit, confirm your measurement before ordering.
| Ex Sidere size | Cartier size (circumference, mm) | Inner diameter, mm |
|---|---|---|
| 1 | 48 | 15.3 |
| 2 | 50 | 15.9 |
| 3 | 52 | 16.6 |
| 4 | 54 | 17.2 |
| 5 | 56 | 17.8 |
| 6 | 58 | 18.5 |
| 7 | 60 | 19.1 |
| 8 | 62 | 19.7 |
| 9 | 64 | 20.4 |
| 10 | 66 | 21.0 |
| 11 | 68 | 21.6 |
| 12 | 70 | 22.3 |
Steel or titanium?
For the same volume, titanium is lighter than stainless steel. Steel gives a form more weight; titanium reduces it. The exact weight and surface character also depend on the alloy, size, geometry and finish.
Are these photographs?
No. The images and film are digital visualizations made from our ring designs. They let you inspect the geometry and intended matte surface. Colour and surface appearance depend on lighting and rendering.