You should receive the stone in the mail after completing the achievement. It is possible that it is taking longer than normal for the system to send it out. I'd agree with the others, submit a ticket either in-game or through the Support site.
Compromise is a basic negotiation process in which both parties give up something that they want in order to get something else they want more. Compromises usually occur in win-lose situations -- when there is a fixed pie to be divided up, and whatever one side gets, the other side loses.
The U.S. Constitution was a system that would please all the states of the country. One compromise is the legislature-the law making part of the government. The legislature (Under the Constitution) is divided into two parts: the House of Representatives and the Senate.