The present watch carries a diamond bezel with black sapphire hour markers and a diamond-set case. Rolex uses abbreviations like “SANR” to refer to the specific combination of gemstones, in this case “saphirs noirs”, or “black sapphires”. The reference 116758 SANR is one of only a few gem-set GMT-Master references and will certainly draw a lot of attention to the wearer's wrist.