As a 36 druid I received a task to explore one of their camps and kill 10 Iksar Treasure Hunters. The task was give by the quest npc in Dreadlands near the druid rings.
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"Citing your sources isn't spoon feeding, it's basic 101 if you're making an argument."-Jophiel
These things are uncharmable (at least, the one I tried to charm was uncharmable), which proved a most unpleasant surprise when I attempted to charm kite them. Fear kiting works fine, though, as the area is quite devoid of wandering mobs.
killed about 20 to 40 of these guys (mixed with the rare mercenary) best drop I got was emeralds. dropped maybe 3 to 4 of them. No other Gems. Every other drop they had seemed to be Enchanter pages for level 29 / 34 Enchanters spells.
Had a few only about 3 out of 20ish con blue to me at 46, most were green, generally low green. Also at at least 2 camps I saw multiple specs, and 1 roaming spec through due to the rain visablity was cut seriously so there are probably more. This is the only place I know of in the zone that the specs roam besides the graveyard in front of the entrance to the emperor (and there they only roam with in the gy).