i make it a point to always fill up all the slots in my market in dragon city to avail of the free 1 gem. but whenever i exit game and return afterwards that hard earned gem disappears. anyone else having the same problem? how is this solved?

@jerekiel That is a very old bug that was never fixed. It is the same for us all. We loose the gem and when you want to buy something with it, the game will reload.