Gems can be collected when you level up. When you level up you will get 1X Key, 20X Gems, and Coins.Gems can be collected when you bought an offer called Gems Sale. When you buy Gems Sale or village life events offers in Village Life you will get free gems you can use it when you buy Baby Potion. Other things you can use with gems are: Buy buildings, animals, nature,and ornaments that are nedded to be bought with gems you could also use gems for instant building buildings, and instant collecting resources.