Each time you craft there is a chance to create a "special" item. Your attempts only prove that you weren't lucky enough... But there is a way to increase this chance. Buy a tool that will add you a bonus, try crafting at your guild's proper facility, if you have any crafting set (or piece of it) equip it (at your crafting doll not battle doll). And give to your crafting time by modifying the proper slide at crafting screen.
If you do some of these then you will have some Exceptional gloves at your inventory soon.
Don't give it up...
EDIT: Base chance is 8% and the game uses also the term Superb....