I've run around mining at level 12 for about a day now and all I've got is 4 diamonds(lol). In a previous game a few weeks back, I had over 20 diamonds after a couple of hours. That's rng for you. Just looked at the ic2 recipe for the mfe... which nowadays requires *12* diamonds*. Lovely. Anyone who plays gregtech with latest ic2ex and knows if he still has diamond creation disabled in the compressor? I think it was like obsidian and 64 coal = 1 diamond. Last time I checked which was about a year or so ago, that recipe was disabled in gregtech.
<edit> I'm running a modified 1.6.4 ftb, which has similar mods but latest versions and of course no TE or mystcraft... /sigh. Beside that it's great... oh yeah, it doesn't have gregtech, hence I had to ask the question up top!