A Crafted Item is an item which many mods attached, and it resembles the rare item.
A Crafted Item is created by differing from other items fundamentally and transmuting the specified ingredient by the Horadric Cube. Refer to Recipe Page.
Moreover, since a Crafted Item has some recipes and "the fixed effect" is decided by each recipe, it is easy to create the item which its mod needed attached.
A craft can be performed also by Amulet or Ring and differs from Imbue which is the reward of Act1Quest5.