Enamel for the duration of a system that requires 80 hrs. It is available in 18-karat white gold with many shades of green or in eighteen-karat pink gold with blue hues, both of those accented with diamonds. The bottom steel of every is 1st sealed which has a transparent enamel https://www.watchesworld.com/from-sean-to-daniel-tracing-the-evolution-of-james-bonds-iconic-watch-collection/