Crown

From DwarfFortressWiki

A Crown is a craftable item. It serves no purpose except as an export good until after the dwarven economy, when it will become a wanted trinket among some dwarves.

Crowns can be made from materials accessable by any craftsdwarf, which includes stone, metal, wood, shell and bone. On occasion, a dwarf in a strange mood will make a crown out of materials not normally suited for crowns, such as cloth.