Board Thread:Online Discussion/@comment-96.249.254.252-20140702171415/@comment-6881629-20150222212259

If you can't get the two gems in Kagrumez from the Reaver then your really in trouble on a console as the ruins don't respawn so i don't think theres any way to fix it, if your on PC you could try using a console command to add a gem -

player.additem XX02145A 1

The XX being your Dragonborn esp load order (see here if you don't know it).