Enamel all through a system that will take 80 hrs. It comes in eighteen-karat white gold with several shades of green or in eighteen-karat pink gold with blue hues, both accented with diamonds. The bottom steel of each is to start with sealed which has a transparent enamel then layers https://www.watchesworld.com/from-sean-to-daniel-tracing-the-evolution-of-james-bonds-iconic-watch-collection/