Farming for Pristine Black DiamondsPristine Black Diamonds are used with librams for the "Insane in the Membrane" achievement. As far as farming them goes, there are three different places for players to farm for Pristine Black Diamonds, Stratholme, Scholomance and Dire Maul. Scholomance is your best choice for farming them followed by Dire Maul and finally Stratholme in last place. Stratholme is actually so bad for farming them that I ONLY recommend going there if you're missing Baron Rivendares Mount. Dire Maul - Dire Maul has two different paths you can use for farming the diamonds. One of them is running Dire Maul north to free the goblin and raise your goblin reputations and the other is running Dire Maul west. I only recommend running Dire Maul north if you need the goblin reputation, otherwise west is your best place for finding the goodies. Stratholme - As mentioned before Stratholme is a rather lack-luster place to farm for Pristine Black Diamonds. I only recommend coming here if you need Baron Rivendares mount. Scholomance - Scholomance is the best possible place for you to farm for Pristine Black Diamonds. With the sheer amount of mobs you can find here the chances are good that you will find one rather quickly. To make things easier i am going to seperate all three of these locations into different sections and go into further detail explaining each one of them. Dire Maul Pristine Black Diamond Farming
As mentionted before Dire Maul has two different paths for farming that you can follow. One of them is a Diremaul North Goblin Reputation Run and the other is a Diremaul West Run. As mentioned before I only recommend running Diremaul North if you need the goblin reputation otherwise Diremaul West is where you will find more goodies to sell on the Auction House like Librams or Pristine Black Diamonds. Items of Interest
Stratholme Pristine Black Diamond FarmingWell, as you've been told multiple times already Stratholme is not the place you wanna be for farming the Pristine Black Diamonds and I only recommend coming here if you need Baron Rivendares Mount. Scholomance has more mobs than Stratholme and they're all much less annoying. Also all of the mobs in Scholomance are much more bunched together. In other words if you're in Stratholme and have Baron Rivendares Mount already, get out and go to Scholomance. Items of Interest
Scholomance Pristine Black Diamond FarmingScholomance is your best possible option for when it comes to farming Pristine Black Diamonds. The amount of mobs that you will find in scholo is unrivaled in either of the other instances. And as you already know, more mobs = better chance of phat lootz. Remember to disenchant all greens and blues that you find in Scholomance, or get a freind to do it. The Large Brilliant Shards, Greater Eternal Essences and Illusion Dust sell for quite a bit. Items of Interest
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Libram of Focus
Libram of Protection
Libram of Rapidity
Pristine Black Diamond
Runecloth
Green & Blue Items 
Vendor Trash 
Dark Rune