"Diamanten voor Catan" (Diamonds for Catan) is a separately sold expansion for Catan. It needs the Catan: Seafarers expansion to be played.
People are rarely ever satisfied. The settlers of Catan have everything their heart desires, until news reaches them that diamonds are found on a few of the neighboring islands. The greedy inhabitants immediately leave to seize as much as possible. Of course the pirates stand ready to rob them of their precious stones. Most settlers, however, succeed in getting some stones back home.