If you don’t know your ringsize, you can do following:

1. Use a ring which fits well on the finger:
- Take an existing ring that fits well on the desired finger
- Measure the diameter of the ring in mm
- Select the desired ring size in the size chart which corresponds to the
diameter
- Tip: If the diameter is between two ring sizes, select the bigger size

2. If you don't have a ring, measure your finger with a paper strip:
- Cut out a narrow strip of paper, about 10 cm long
- Wrap it around the finger on which you want to wear the ring
- Mark the overlap and measure it in mm
- This is the circumference
- Check in above size chart the corresponding ring size