Enamel during a process that can take 80 hours. It comes in 18-karat white gold with various shades of environmentally friendly or in 18-karat pink gold with blue hues, equally accented with diamonds. The base steel of every is 1st sealed having a clear enamel and then levels of opaque https://www.watchesworld.com/from-sean-to-daniel-tracing-the-evolution-of-james-bonds-iconic-watch-collection/