Don't know your ring size. Order one of these to check your UK ring size. And if you subsequently purchase a ring from me which is over £50 in value I will refund this cost. Domestic shipping on this is free.
I have tested this sizer against mine and it is accurate for a thin band. If you are looking to buy a wider ring, you may need to go up a half to a whole size. Please contact me if you have questions.
Fingers will swell in heat and shrink in cold. This is normal.