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 Great Compromise (Connecticut Compromise) was a plan that settled the arguments when it came to how to set up our government. It basically made the choice, when it came down to the New Jersey Plan (favored the smaller states) or the Virginia Plan (favored the larger states) . This compromise kind of put these two plans together.