Gantru Raldukans have two different kinds of drops.
The first kind are the items that they always drop. As semi-named mobs, Raldukans drop one of the following three droppable items every time:
Gantru Charm (common)
Helm of Raldukan (uncommon) - this is the pink one
Gantru Warmask (rare)
The second kind are the Raldukan armors, which are fairly rare, no drop, and have a silver plate look. This helm is part of the Raldukan armor set. I have actually seen this helm and the Helm of Raldukan both drop off the same one before. They're just two nice items.
Dementieva
Oracle, Tallon Zek