Enamel through a course of action that will take 80 hours. It is available in 18-karat white gold with different shades of green or in 18-karat pink gold with blue hues, both equally accented with diamonds. The bottom metal of each is initial sealed having a clear enamel then layers https://www.watchesworld.com/from-sean-to-daniel-tracing-the-evolution-of-james-bonds-iconic-watch-collection/