You're an imbecile. No way, no how would a GM give you a whole new item because you are too slow to realize that you put a wrong gem in. Hell it even has AN ACCEPT DIALOGUE BOX!
GMs do not, and I repeat, do not give entirely new items to people because of incorrect gems/enchants. The items are ALL resocketable and reenchantable so if you put the wrong gem in, even if the gem costs 300g, they will at-most, if you by some god-forsaken reason find a retarded, doesn't care about his job GM, give you the gem back.