Winning tournaments gives you the opportunity to earn at least fifty diamonds every eight days. Farm other players for four days by concentrating on getting as many resources as possible, but losing all fights. The goal is to reduce your medals and rating while increasing your resources for upgrades. When a new tournament begins, you will be matched with lower level players. You will have an easier time growing and winning the tournament. Join a good, organized clan and participate in winning clan tournaments. Leave open areas on your map for debris to accumulate. Cleaning debris will usually reward you with one to three diamonds. Clean debris on your base, and win clan and individual tournaments to earn diamonds. Do not spend diamonds to rush production, unless you have them in excess.