The Rolex Green Submariner belt is green gold. Among the Green Water Ghost brands in Rolex, the green color of the Green Water Ghost belt is not just a simple green. It is the first initiative of Rolex’s “green gold technology”. Rolex’s European patent EP1887052, the inventors are Fink-Petri Alke and Hofifimannl Heinrich Fink. Petri Alke is a the scientist. It makes sense that Rolex's green belt is called "green gold" because gold is indeed used in the material, and this technology can not only produce green gold (an alloy of gold and silver) but also gold in multiple colors.