Enamel through a process that requires 80 hours. It comes in eighteen-karat white gold with numerous shades of eco-friendly or in 18-karat pink gold with blue hues, the two accented with diamonds. The bottom metal of each is initial sealed which has a clear enamel after which you can levels https://www.watchesworld.com/from-sean-to-daniel-tracing-the-evolution-of-james-bonds-iconic-watch-collection/