Originally Posted by MRT2

A diamond frame refers to a bike with a top tube. The reason women's bikes traditionally didn't have a top tube is because back when women wore dresses and skirts all the time, the top tube got in the way of the dress. That is the only reason. The triangle shape actually has an important function, as it gives the bike strength without adding weight. Unless you plan to ride your bike while wearing a dress, you are actually better off going with a standard diamond frame.