The Rolex GMT-Master is without a doubt one of the most renowned and sought after models when it comes to watch collecting. The GMT-Master ref. 16758 ‘SARU’ —referring to the sapphires and rubies on its bezel— is a lavishly set with diamonds, sapphires and rubies GMT Master that along with reference 6270 and 6269, was the earliest Rolex sports watch to feature any precious stones. This concept was incredibly daring in the 1980s, as tool watches and luxury gem-set timepieces resided in two separate spheres.