Salvage Problem Vigo's Protective Amulet

I have this amulet in my stash but the game won’t let me mark it as junk or individually salvage it at the blacksmith. It’s not hurting my game play I’m just holding onto the amulet incase a Dev wants to take a look at it under the game hood to see what the cause my be. If not thats ok too

I too have this amulet and it is pretty much not salvageable. From what I understand, Vigo placed a curse on it during the reign of Tul’ Dura. This curse gave it a legendary power to protect its wearer, but it also made it indestructible. Only the ancient blacksmith in the city of Onakardu can extract anything from it. Mostly it turns to few pieces of gold or jewel fragments, but on rare occasion it becomes the original soul stone granting the owner unlimited, blasphemous power. Be wary of this gift.