Enamel during a procedure that takes eighty hrs. It comes in 18-karat white gold with many shades of inexperienced or in eighteen-karat pink gold with blue hues, the two accented with diamonds. The bottom metal of each is first sealed using a clear enamel then levels of opaque white enamel https://www.watchesworld.com/from-sean-to-daniel-tracing-the-evolution-of-james-bonds-iconic-watch-collection/