As of now, you have two choices with upgrades. Wait it out or gem the entire thing. I'm assuming each gem represents a certain period of time... my idea is to be able to gem 1 day at a time. So for example, a 6 day upgrade, you could gem, and it gives you the choice to gem the entire time remaining for 600 gems, or 1 day for 100 gems (giving you 5 days left), 2 days for 200 gems, etcetera.
Thoughts? Comments?

