At what level can one reasonably solo all of the Thurgadin Armor quests?

[Loadsamoney]

I'm about to ding 44 on my Paladin, planning to take Paineel to 50 if I can, maybe even a little higher depending on the captains respawn time, and immediately after that I'm making it a priority to assemble a suit of Thurgadin armor, which means farming the rep and acquiring all the necessary pieces on my own, including gems.

Let's say I do get to 50 before I finally abandon Paineel. Will it be possible for me to solo the mobs needed for the corroded plate pieces at that point? What will be the best enemy for me to farm for the specific gems (maybe excluding crushed diamonds, if they really are 5k a piece...).