You can earn diamonds by completing offers, earning achievements, staying active in your Empire, winning Empire wars, and removing debris from your base. Connect to Face book to earn 30 diamonds. Connect with friends on Facebook to earn 25 diamonds for each friend. Remain active and win battles to increase your rank. The higher your rank, the more diamonds you get. You will be awarded 2,500 diamonds for reaching the Top Grandmaster rank. Save your diamonds to get a third worker. Having three workers on your base is more efficient than purchasing an Essence Mill to increase its production.