Ring size guide

If you have any questions, please feel free to email me, I will be happy to help.

  1. Choose one of your rings as a reference, it must correspond to the desired finger.
  2. Use a ruler to measure the ø inner diameter of the ring in millimeters, taking the distance from one inner edge to the other inner edge.
  3. Consult our measurement matching chart to find the corresponding ring size.


Size ømm US US UK
* 14.6 46 3.75 H
* 15.2 48 4.5 I.J.
* 15.9 50 5.5 K
S 16.5 52 6.5 L
* 17.2 54 7.5 NOT
* 17.8 56 8.5 P
M 18.0 58 9.5 Q
L 19.0 60 10.5 R
* 19.7 62 11.5 S
* 20.4 64 12.5 T

* = on order

Do you still have a doubt or want a custom size?
Order a Fontennoy ring sizer.