There is a husband and wife team who post ads online selling diamond rings. They claim they owned a wholesale diamond company, and due to the economy, they must sell everything for cash. They've been targeting Craiglist and other similar online selling sites. If they feel someone may be on to them, they'll say to meet at a jeweler, but never show up.

Be very careful. They have been using the same cell number since at least March, 2011. So, they're not very good con-artists.  I haven't had a transaction with them. So, I don't know how they would take the money; fake goods or rob and go.