I made an epic gem of many facets. When i made that i open and closed the barter window until i had the right item. I then made it epic. But i am pretty sure i did not get what was in the barter shop. I did however get the one i wanted the most and i think i was just lucky.
Now i am thinking about making the item legendary and my question is: Is there a chance the set bonuses will change again?
And does what is shown in the barter shop have any influence on what i get?