Most people follow the European way.
The wedding ring is worth on the third finger on the left hand for
both sexes. The engagement ring is on the middle finger.
Chances are if you are able to flirt with a guy/lady without the
rings on the above two fingers, they are out to flirt also even
though there are married.
Nowadays even if hard to tell, as long you are in a pub/club, you
are open target. 
