Harper Amulet

Harper Amulet is a quest item needed in the side-quest Find out What Happened to Montaron. It's needed to enter the first floor of the Harper building in the Athkatla Docks. It can be found somewhere on the ground floor in the same building. This item appears in Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition.

In-game description
"All of the Harpers that you have met in this area were wearing one of these amulets. Perhaps it somehow identifies one as being a Harper. Could there be a section of this building that can only be accessed by Harpers?"