A Gorlan prayer stick was an extremely rare artifact, but had no real value as an antique (except, perhaps, to students of archaeology such as Jean-Luc Picard).
Captain Picard was in the possession of a Gorlan prayer stick and kept it in his quarters aboard the USS Enterprise-D. He traded a bottle of very old Saurian brandy for the artifact. He later gave the prayer stick to Jason Vigo as a parting gift. (TNG: "Bloodlines")
It seems likely that the Gorlan prayer stick originates from the Gorlan, whose existence as of yet has only been confirmed for the mirror universe.
According to the script, his name was pronounced as "GORE-lun".