Crafted items' levels can be 3 in the consecutive crafting Tier.
Recipes, bought from NPC shop, always craft items, which levels are "based" for the consecutive Tier.
Recipes, dropped as loot, craft items which levels are higher than the ones that are crafted from recipes, bought from NPC shops.
Note: Jewels don't have levels! They only have Tiers!
Ergo - we can categorize the crafted items as follows:
Crafting Tier 1 - all the recipes here are learned automatically when the hero chooses his profession.
Crafted items are always level 6.
Crafting Tier 2:
- Recipes, bought from NPC shop, craft items which are level 14.
- Recipes, dropped as loot, craft items which are level 16 and 18.
Crafting Tier 3:
- Recipes, bought from NPC shop, craft items which are level 24.
- Recipes, dropped as loot, craft items which are level 26 and 28.
Same logic goes for the rest of the crafting Tiers.