Enamel through a process that can take 80 hrs. It comes in eighteen-karat white gold with many shades of eco-friendly or in eighteen-karat pink gold with blue hues, each accented with diamonds. The bottom metallic of every is first sealed having a transparent enamel and after that layers of opaque https://www.watchesworld.com/from-sean-to-daniel-tracing-the-evolution-of-james-bonds-iconic-watch-collection/