Gold alliance

An alliance in which the leader, and only the leader, can donate 450k after a 2500 gems upgrade of the alliance tower and in which there are also other advantages (suggestions accepted).

Not sure what exactly you are talking about? Can you explain a bit more what you mean?

For example +5% medals for all the members of the gold alliance.

Well first of all, what is a “gold alliance” at all? A premium alliance - in which way? An alliance for getting more gold? …?