http://gw.gamewikis.org/wiki/Gwen%27...Unique_Item%29
http://gw.gamewikis.org/wiki/Rose_Focus
Not sure what they go for - I know they're standard mesmer greens, but I thought the rarity of either the a) reqs to get them and b) skins might make them worth a bit more. Too bad I had to turn in my long-time saved Gwen items to get the quests.
I searched and didn't see any other threads on these - apologies if I missed them.
-- EDIT
I'm about to give up - no one seems to have any idea of GW:EN items and/or pricing. I'll just keep them until I see someone else selling them as well ....