Players can now trade gems, blacksmithing plans, jeweller designs, dyes, crafting materials and training pages in the online auction house.
The ability to trade gold as a commodity is "coming soon", the games developer said.
Bug fixes have also been applied to make sure the 'Bid' and 'Buyout' buttons are correctly greyed-out in the confirmation window when a player does not have enough gold to buy that item.
Unlike previous hot fixes, the patch has to be downloaded to players' PCs. Diablo III patch 1.0.3b has already been released in the Americas and users will be prompted to download it when they log in.
European and Asian players must wait until the patch is released in their region before it can be installed.
Blizzard warned American players that they will not be able to use Global Play to log into servers running in Europe or Asia until patch 1.0.3b is live in those regions.
Several bugs that occurred when players viewed items with two or more sockets in the auction house and profile pages have also been fixed.
A rarer problem that caused the game to crash when an item is picked up in tutorials has also been sorted out.
"If you are experiencing technical issues with the patching process, connecting to Battle.net after installing the patch, or errors while playing a newly-patched game, please visit our support site or post in the Technical Support forum for assistance," the official Blizzard blog post said.