WITH A WIRE
> Wrap a thread around your finger
> Make a mark where the end of the thread touches the rest of the thread, to measure the circumference of the finger
> Repeat this process on your phalanx
> Then lay your threads flat and measure the length in millimeters, the measurement between the 2 will correspond to your size
HOW TO CHOOSE THE RIGHT RING SIZE?
> If you have small fingers, rather thick: avoid rings with flat or very thin frames and opt instead for frames of medium width.
> If you have long, rather strong fingers: avoid very thin frames and favor wide frames which will adapt better to your finger size.
> If you have long, slender fingers: you're in luck, all ring frames will fit you so take advantage of them!
Note: In summer and at altitude, fingers may swell due to heat or pressure. Also be aware that the fingers will tend to be more swollen in the morning when you wake up than in the evening. Be careful not to have too swollen fingers when measuring your finger size!
Finally, if you want more comfort, do not hesitate to order your ring with a half size more so that it can remain comfortable with the climatic changes.