Enamel through a method that can take eighty hrs. It comes in eighteen-karat white gold with various shades of green or in 18-karat pink gold with blue hues, each accented with diamonds. The bottom steel of each is first sealed that has a clear enamel after which layers of opaque https://www.watchesworld.com/from-sean-to-daniel-tracing-the-evolution-of-james-bonds-iconic-watch-collection/