Mekanism Crushing
Use a mekanism crusher to automate getting gem dusts
Create Crushing Wheel
Use the create crushing mechanics to automate getting gem dusts and get some extra stuff while you're at it
Epic Recipe
Shapeless recipe using 8 gem dusts and 1 rare material
Rare Recipe
Shapeless recipe using 8 amethyst shards and 1 uncommon material
Create Pressing
Use create's press to automate getting gem dusts
Uncommon Recipe
It's a shapeless recipe using 8 leather and 1 common material