1 GEM = Collector boost, 1 week only

As a reward / celebration from Mr. Supercell we've all been given the chance to take up a 1 week offer....

In exchange for 1 Gem (per collector) you can boost your Elixir/Dark Elixir/Coin collectors to double their normal rate for 1 week!

If you haven't done it yet - GET ON IT - I think there's about 3-4 days left only - then it runs out!

Personally I'm using it to help me do the expensive defensive upgrades (coins) & the Elixir - I'm saving up for the 7.5M cost of lvl 6 Archers!