The dusted Silver necklace is a quest item used in the Murder Mystery quest. It is made by using the silver necklace on the flour barrel. Flypaper is used on it to create Anna's print, which can be compared with the unknown print to see if Anna is the killer.
This item will disappear if a player has it in their bank or inventory upon finishing the quest. It is a unique cosmetic item, so if a player wishes to keep it, they must drop it before finishing the quest and pick it up again afterwards. It cannot be obtained again after the quest is finished.