Blizzard poster Eyonix highlights some changes that will be coming to the Auction House User Interface with Patch 2.1:

With that being said, we're also working to improve our user-interface, which includes the auction house. Below are some of the changes slated to be implemented for the next patch.

• The Auction House now has a reset button that will reset all fields you have entered to allow you to quickly try a different search.
• When items are being put up for sale on the Auction House, if the item you are putting up for bid is the same item and quantity as the previous item you put up for bid, it will automatically fill in the price and buyout for you with your previous price.
• Gems are now searchable in the Auction House under the heading of Gem with the gems then broken up by color so you can search for all gems of a specific color.