This page shows you how high you need to either make a stone or convert materials.

Such as:

Fish into Scales:         Tier 1 needs a total skill of 0

Ore into Geode:        Teir 10 needs a total skill of 30

Plant into Dye:          Teir 30 needs a total skill of 99

Enchanting Stone:    +38 Stone needs a total skill of 127