my friend's long time boyfriend wants to give my friend a surprise gift... and he asked us to discreetly find out her ring size for him... 
so i am wondering if you gals and guys know of any good way for me to find this out without being overly obvious that i am up to something? please help!
TIA!!

so i am wondering if you gals and guys know of any good way for me to find this out without being overly obvious that i am up to something? please help!
