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11.2s 111.1w in the Silvertine Lodes zone is the location.

It's in the goblin camp, you get there when you go from the nearby dwarfen camp (don't remember it's name, something with deep i think) down and at the bottom of the way is left a way further down to the goblin camp and right is a way through the rocks to the other crystals. Take the left path and try to get to the far right side of the goblin camp. There is a shortcut through the rocks on the right side of the way to the camp (There is also a quest-dwarf there).

I don't know if any of these are the BEST way, but rather than leave this question unanswered, here are the different ways I've found:

• Questing and mob-killing in Moria will generate reputation items over time, that can be traded in for reputation.

• There are a bunch of assorted quests in Moria that give IGG reputation.

• There are six crafting quest dailies at three different locations that can be used to generate a lot of crafting resources (if you're set to the right ones) as well as about 1400 Guards reputation points each. (and 700 Miner reputation points as well) That's ~8400 a day, which will take you from nothing to Kindred in a little over 10 days, without having to do anything else.

• Running the Grand Stair instance allegedly gives IGG reputation as well.