This quest was marked obsolete by Blizzard and cannot be obtained or completed.
Bring an Azerothian Diamond and a Pristine Black Diamond to Lord Grayson Shadowbreaker in the Cathedral District of Stormwind.
We now must assemble a Divination Scryer - this will begin the trial that will allow you to redeem the fallen charger. Your scryer, actually, is almost done. The exorcism censer used in Terrordale is the catalyst for it, and I will fashion a suitable housing for the device.
The last components needed, though, are two diamonds. They must be as juxtaposed in brilliance as they are in purpose - an Azerothian and a Pristine Black. These two will be the beacon by which the scryer will pierce the shadows!