You may know the expression ‘diamonds are a girl’s best friend’ but you may not know its origin and why it is that it sticks in your head. It comes from a song in a Broadway show but was made a very famous statement by the late Marilyn Monroe in one of her movies. It is a song that many Australians are able to sing and so the expression still sticks around even to this day. If you were to ask any Australian lady what kind of ring that she would like bearing in mind that she can choose any jewel currently available and the vast majority will always say that they would like a diamond. If you are reading this article because it is your wish to propose to the lady in your life and you’re not sure what kind of ring to go for then you really cannot…