Special knives

Exploration Stage: Traveling Circus
From: Fabien Delamode
Description: Do you have any good evidence? He said he had left it there because he was not allowed to bring weapons into the venue. I remember seeing a beautiful knife around here. Would you be willing to search for it with me?
Completed: Yes, it is this knife that I found suspicious. I wonder if it was stolen...no, it seems not. See, the blade is heavier than the handle. This is definitely something used for knife throwing. What looks like jewelry is just colored glass. It is lighter than jewelry and very inexpensive.