Enamel for the duration of a approach that requires 80 hours. It is available in 18-karat white gold with many shades of green or in 18-karat pink gold with blue hues, equally accented with diamonds. The bottom metal of each is initially sealed by using a transparent enamel then layers https://www.watchesworld.com/from-sean-to-daniel-tracing-the-evolution-of-james-bonds-iconic-watch-collection/