I've picked up at least 6 unique items from ancient hunts that are not gilded. 

I'm wearing luck of the sea armor. Only unique weapon and armor drops seem to be affected, as I have not received any rare or common non-gilded rewards yet. Assuming it may have to do with luck of the sea granting me uniques, just not making them gilded. 

Sucks I was burning experience points for my hunts.