All of the Sweet Gum I've ever turned, I bought online from the southeast. Over the years, every piece I've ever turned had this dark multi colored look with pretty nice figure. Once turned, it is failrly bland looking, a sort of light grey/brown color, but once an oil finish hits it, it gets wild looking like this.
It always comes green, and moves a lot as it dries, so I have to leave it a little extra thick.