User blog comment:Jojo-a-gogo/What do you guys think the chain on Kurapika's pointer finger does?/@comment-5838283-20121207053821

Maybe its something totally arbitrary. "materialize food for noming." That would always be useful.

Or, something related to his past. Maybe with sentimental value. Thus it either has no use in combat or it couldn't be revealed until after the conclusion of the Recollection Volume.

Or maybe its just decorative. you know, for style. xD