How do jewelers actually resize a ring? And how much does this service usually cost?

How do I secretly find out what my girlfriend's ring size is?

Does my girlfriend have to get sized for a diamond engagement ring before I buy it or can I get the diamond ring resized later?

How can I figure out my girlfriend's ring size without straight up asking her?

Is it true that my fingers are bound to swell up during pregnancy? Does that mean I have to take off my wedding ring?!

How can I measure my ring size on my own?

Can all rings be re-sized?

I want to order a diamond engagement ring for my girlfriend online. How do i let them know what size i want?

Is there any correlation between ring sizes and body measurements, i.e. height and weight?

Are there certain types of rings that are recommended not to be resized?