this afternoon I encounter this question for the first time, first I began to think that is AH busy. Later discovered that may be the article itself, because not all things can not auction. find baidu, google for a long time, in the forum on the official website, there are many people encounter this question, But did not find a good method.
I have known to two method.
1. If there is a hole, relieved gem, I did not encounter such items, but players have succeed.
2. I personally test, dead time or to please put the items out Durability.
Summary that is to make you become not the same thing can be auctioned, may be the bugs out of the Blizzard in order to prevent the items to copy.