Find the right size for your ring
Get a (flexible) tape measure, wrap the tape measure around your finger in the position where your ring should go.
The measurement in centimeters you get is the right one for you.
If you don't have a tape measure available, you can use a strip of paper, a piece of string, or a cotton thread.
Roll it around your finger and mark the closing point (be careful the strip must be snug, but comfortable).
Then lay the strip out on a ruler or rigid measuring tape and transfer the centimetres to the point marked previously.
OTHERWISE
GUIDE TO CHOOSING THE SIZE:
Size 8: diameter 1.53 cm, circumference 4.80 cm.
Size 9: diameter 1.56 cm, circumference 4.90 cm.
Size 10: diameter 1.60 cm, circumference 5.02 cm.
Size 11: diameter 1.62 cm, circumference 5.09 cm.
Size 12: diameter 1.65 cm, circumference 5.18 cm.
Size 13: diameter 1.68 cm, circumference 5.28 cm.
Size 14: diameter 1.72 cm, circumference 5.40 cm.
Size 15: diameter 1.74 cm, circumference 5.46 cm.
Size 16: diameter 1.78 cm, circumference 5.59 cm.
Size 17: diameter 1.81 cm, circumference 5.68 cm.
Size 18: diameter 1.85 cm, circumference 5.81 cm.
Size 19: diameter 1.88 cm, circumference 5.90 cm.
Size 20: diameter 1.92 cm, circumference 6.03 cm.
Size 21: diameter 1.95 cm, circumference 6.12 cm.
Size 22: diameter 1.98 cm, circumference 6.22 cm.
Size 23: diameter 2.00 cm, circumference 6.28 cm.
Size 24: diameter 2.04 cm, circumference 6.41 cm.
Size 25: diameter 2.06 cm, circumference 6.47 cm.
Size 26: diameter 2.10 cm, circumference 6.59 cm.
Size 27: diameter 2.12 cm, circumference 6.66 cm.
Size 28: diameter 2.15 cm, circumference 6.75 cm.
Size 29: diameter 2.19 cm, circumference 6.88 cm.
Size 30: diameter 2.22 cm, circumference 6.97 cm.
Size 31: diameter 2.25 cm, circumference 7.07 cm.
Size 32: diameter 2.29 cm, circumference 7.19 cm.
Size 33: diameter 2.33 cm, circumference 7.32 cm.
