I just started a second world, and I'm curious how those of you who play in multiple worlds decide which world to spend your diamonds since they work across worlds. I only use mine for expansions. I understand the benefit of having diamonds work across worlds if you have one main world, but I want the same advantages/disadvantages in both so I think it's going to be hard for me to decide where to spend them. For me, I wish they were kept separate (yes, I could keep track myself but blah!). BTW, I do not buy diamonds so I can only earn them through game play. Thanks!