Ring Size

FACTRON rings are machined, so they cannot be resized.
Please be sure to confirm your exact size.

1. When measuring yourself

Prepare a thin strip of paper or cotton thread and wrap it around the widest part of the finger where you want to wear the ring (e.g., the second joint).
Mark the overlapping part with a pencil or a thin pen, then measure it with a ruler.
Find the closest size from the table below.
If there is swelling, add about 0.5mm to the measurement.

Please use non-stretchy paper or thread and measure as accurately as possible.

Alternatively, measure the diameter of your own ring and find it in the size chart below.

2. If you would like to borrow a ring sizer

We will send you a specialized "ring sizer" to measure your ring size.
Once you receive it, measure the size of the finger where you want to wear the ring and notify us by email.
A return envelope and shipping label are included, so please return the ring sizer.
Once the return is complete, your order will be finalized and manufacturing will begin.

■■■ The customer is responsible for the round-trip shipping costs of the ring sizer. ■■■