Gem of Longevity is for Monk Twighlight Armor Quest see site in Eqdruids on it. This little fello conned blue to my 45 dru and did not resist that much.
I killed this thing in the Scarlet Desert the other day, not to hard for me (50 - druid) to solo. He dropped a Gem of Longevity. No clue what that is for.