When you get down on your knee to propose everything has to go absolutely perfect. The moment has to be right and you hope and pray she says yes. Buying a wedding ring is a huge purchase guys. Asking a salesman's opinion is simply not good enough.

If you want to do this right you need to buddy up to one of your girlfriend's pals. Not only do you need to know her size but also her style. If she's into white gold and you get yellow gold, she will not be pleased.

Also, her girlfriend probably knows her size, and if she doesn't she can find out without anyone getting suspicious. For a sizing chart check out the link below.

http://www.celtarts.com/ring_size.htm