Enamel during a method that requires eighty hours. It comes in eighteen-karat white gold with many shades of green or in eighteen-karat pink gold with blue hues, both accented with diamonds. The bottom metal of each is to start with sealed with a transparent enamel then levels of opaque white https://www.watchesworld.com/from-sean-to-daniel-tracing-the-evolution-of-james-bonds-iconic-watch-collection/