I identified many other items since, though all at merchants instead of using the skill. I had no problems with any of them. This necklace was really strange. I took it off, and the description then was completely wrong. It turned into an unmagical item, and if I put the mouse over it, it read glove or shoe. It never re-gained its properties, so I got rid of it. Sad to see such a bug in a great game.