Use a mekanism crusher to automate getting gem dusts
Use the create crushing mechanics to automate getting gem dusts and get some extra stuff while you're at it
Shapeless recipe using 8 gem dusts and 1 rare material
Shapeless recipe using 8 amethyst shards and 1 uncommon material
Use create's press to automate getting gem dusts
It's a shapeless recipe using 8 leather and 1 common material
Shapeless recipe using 8 rare materials and 1 epic material