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.
Confidence votes 125. The Great Compromise was an agreement made among the delegates to the Constitutional Convention of 1787 that the US government would have two legislative houses in Congress: the Senate where each state has two Senators, and the House of Representatives where each state has a number of Representatives based on population.