There is absolutely no difference at all.
Greg just likes to have the distinction of having the FLAGSHIP model.
OOOOOHHHHHHH.
Diamonds & Emeralds. Please.
I've looked at the specs before. I think the big difference is in the picture quality. If you can see the better picture quality of the Diamond, buy it. If you can't see the better picture quality of the Diamond, buy the Emerald.
There's no way I'm buying the Emerald because I don't want him to have the "better" TV. I'm waiting for the 80" FL-Diamond series.