Looking at the gen photos and video montage on the "R" official website, the blue / black color seperation appears to be just like the gen. Keep in mind, the color seperation is meant to be clear cut, as the blue color denotes daytime, and the black nighttime.
The bezel is full ceramic, I would imagine they use some sort of painting process to create the halved colors. The gen version achieves the process by utilizing chemical compounds during the heating process which turns half of the cerachrom bezel insert black.