76 I found a GREAT crafting loop hole. Actually, 2. One allows you make diamonds out of nothing the other using trees.
The tree version (probably the cheapest)
use a tree to make charcoal and sticks
use the charcoal and sticks to make torches
turn the torches into coal using the precision sawmill (this actually also gives you sticks)
turn the coal into coal blocks
compress 16 coal blocks to get a diamond
the "diamonds out of nowhere" requires a combiner from mekanism. So.. when you make this one you probably don't need it anymore. Oh well. Its still a fun one
Use cobble + 3 coal dust to get 1 coal ore using a combiner.
throw the coal ore into a "crusher" from WTBW machines. This gives you 3 coal + 1 coal dust + 75% chance of another coal. Also 30 % for 1 cobble.
I don't have to explain more, do I?