Z wrote
It's true that IVAN does not allow wishing for materials which the character has not seen yet. However, if your character sees the material, it does not mean that you notice it. Rings and wands are made of lots of special materials, and some good ones can be seen in Attnam. For example, the smith and the tailor wear ommel hair.
I vaguely remember something of the sort from a long time back. Maybe a feature from a previous version?