So today i accidentally gemmed the wrong socket into my head item.. So i paged a GM telling him about what i did, and he told me to wait.. so i did.. about 4 minutes later, he sent me in game mail with the exact same item, but this time, with no gems in it...
i don't know if this works all the time, or if it was just a one off thing.. but it worked for me! Rest assured, i sold that item he gave me for 2k gold on auction house! (Belt of the black eagle)
Sorry if its a repost!