Synthetic Diamond

Materials
256 Coal (4 Stacks) and one flint.

Slimefun Perks
Things you need to unlock via the Slimefun guide:

Machines
Enhanced Crafting Table, Compressor, Pressure Chamber

Resources
Carbon, Compressed Carbon, Carbon Chunk

Alloys and Synthetic Gems
and Synthetic Diamond

Crafting
If one of the steps metioned before shows an error message in the chat check if you lack one of the required Perks or if the items in the Multiblock structures are placed in a wrong order
 * Build the Machines in the World if you didn't before
 * Put the Coal into the Compressor and use it, you should get 32 carbon first (they can stay in the compressor)
 * Use the compressor again to get 8 compressed carbon, get the compressed carbon out of the compressor
 * Put the 8 compressed carbon around the flint in the enhanced crafting table and use it, you should get a carbon chunk
 * Put the carbon chunk into the Pressure Chamber and use it
 * You got yourself a Synthetic Diamond!

Use
You can use synthetic diamonds to craft tools and armor. They work like normal diamonds.

Because they are different items Synthetic Diamonds won't stack with normal diamonds.