Gems, dyes and other commodities come to the RMAH

In a good Blizzard tradition, "soon" is set as the date for when commodities will arrive at the RMAH. Gold, however, will not be available until later moment.

Community manager Cerunya wrote:

"The following commodities will be available for trading in the real-money auction house:

Gems
Dyes
Crafting Materials
Blacksmithing Plans and Jeweler Designs
Pages of Training

The ability to trade gold as a commodity won’t be included in this initial update, but we hope to enable it in the near future. Keep an eye on this thread for further updates."

Source: Battle.net