Thank you for contacting the World of Warcraft Game Master Department. 

Issue Reported: 
Stupid omokk keeps dropping skyshroud leggings, will not drop gem for UBRS
quest.  Killed him over 20 times now, please help,

The issue reported above is not considered to be "broken" and should be
functioning normally. If you feel that the functionality should be different,
then please visit the Suggestion Forum
(http://forums.worldofwarcraft.com/board.aspx?fn=wow-suggestions) and post a
suggestion. These forums are regularly monitored by the World of Warcraft
development team.  

I can assure you the loot table for this boss is correct and you will just need
to keep trying.

You can also check our general forums (http://www.worldofwarcraft.com/forums/)
where you can discuss game issues with other players.

Thank you again for contacting us. We hope you continue to enjoy your experience
in World of Warcraft!

*** Please do not respond to this emai