Serti dial is a term used to describe a Rolex dial with precious gems such as diamonds, rubies, sapphire, etc.
The term “serti” is short for the French word sertissage which translates to gem setting or mounting.
One of the most popular of the serti dials is the Serti Submariner.
The serti dial example pictured above is from a Rolex Serti Submariner 16613T.