I think I know, but I want to give someone else a chance to guess. Perhaps this question will help: Is the item found in the zone Cazic-Thule? (Edited before question was answered.)
YES - Is an item. - Can be equipped. - Visible to others when equipped. - Found in only one zone. - Present in classic EQ. - Can be equipped in Primary. - NPC Drop - Quest Related NO - Specific to a class or archetype. - Weapon - Flagged as 'Artifact' - Shield - Head slot item. - Fishbone Earring - Glowing Black Stone - Found in Cazic Thule.