Well, I was able to trace the inside of my girlfriend''s ring this weekend. Unfortunately, she only wears rings on her index finger, so the size isn''t exact, but it should just be a tad smaller for her ring finger. My question is this: I measured 15mm for the diameter (inside of the ring), and when multiplied by pi I get 47.1mm, somewhere between a 4 and a 4.5 size. I should go with the 4 which measures a 46.7mm and it should fit great on her ring finger? Just wanting someone to double check my math, and make sure I am taking the right measurements here. 
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