Definitely agree with the above responses. I had the same confusion after seeing some various pics of the two from different sources, but having both of them the difference is very clear. The 4 color does have a purple base, but it lacks the richness and brightness of the TD. The eyes of the 4 color can vary a little and they do have a slight orange tint to them, but nothing like the TD does, which is almost similar to the eyes of the My Miami, though not quite and bright or intense. I like them both, but the TD is the clear pick for color and one of my favorite chalices overall.