In Diablo 3, dyed items that are listed on the auction house will lose the dyed color or property – when listed. However…dyed items may be dropped on the ground or traded to other players – and still retain their dyed properties.
Given that there will be some highly prized and exclusive dyes available in the game, for example, the dye from the Diablo 3 Collector’s Edition – this is important info.
If you want to trade a dyed item to a friend or another player, then you must sell or trade the item directly — do not use the auction house to sell dyed items in Diablo 3. Of course, you’re free to list the dyed item on the auction house, but don’t expect to get the added value from the dye, as it will be removed upon listing.