/evilwarnul is a place built specifically for Diamonds of Nulgath farming. However it takes a lot of time for all the quest drops.
But, instead you can do the Dreadrock Gem Exchange quest from Enntropy in/dreadrock. It gives 5x Tainted Gem, 3x Dark Crystal Shard and 2x Diamond of Nulgath.
The quest may not even give any items but it is far easier and faster than the quests in /evilwarnul. Especially if you have a class like shaman or blaze binder, you will be speed through the farming.
This is only for free players. Members can do quest from Gem of Nulgath pet. It takes time but is worth the farming.
Hope this helps
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