Once you crafted 10 blocks of coal it gets really anoying...
HERE comes my mod:
The Compressor allows you to turn 8 carbon into one diamond!
the process is long, but you can get more of them to start a factory ;)
you can get the carbon by crafting a 2*2 square of coal lumps!
Hope you will enjoy this becuz it's the first useful mod i make! ;)
Screenshot: