I just tested this as someone was saying T6 Gems were missing from the market. The Catogory of Enchanted Gems is missing from the market Catogory bar on the lefty of the market window. Also you cannot search for i.e. Keen Magical Crystal. I know there is a Keen Magical Crystal on the market becuase I created one and put it up for sale. Its in my managed items and in the recent sales order window but not searchable.