This is a good app for all clashers to calculate the number of gems you need to buy for a certain amount of gold, elixir or time. This app also show you how to get free gems & calculate XP in Clash of Clans 2017.
This is NOT a cheat but a way to calculate how many gems you should buy.
Clash Gem Calculator will let you calculate the gem cost for the following in Clash of Clans:
- Gold or Elixir - Dark Elixir - Time - XP Calculator