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 The Great Compromise of 1787 is an event of great importance in the US history. It laid the foundation of the present day structure of the US Congress. It was an attempt to address the concern of proper representation of both the larger, more populous states and those with smaller population.