If you are a passionate shard collector like we are, once you enter a dungeon in search of the shard, you always aim for the smaller rooms. That should be the case this time, too. It is set in the small room in northeastern Coldrock Diggins, surrounded by beautiful blue gems.
Coldrock Diggins solo dungeon entrance.
Coldrock Diggins entrance map location.
Inside the brightest part of the mine.
Exact location within the dungeon.