The Necklace of the Dwarves
+4 strength, constitution, infravision. Provides resistance to fear. Cannot be harmed by acid, electricity, fire, cold. Speeds regeneration. Prevents paralysis. Grants the ability to see invisible things.
Radius 1 light.
Min Level 50, Max Level 127, Generation chance 2, 0.3 lbs

(Angband 3.1.2v2)