My 40-year old Rolex catalog lists four colours of blue dials for the Day-Date models. Sky Blue, Roman Blue, Lapis Lazuli (which the subject dial definitely isn’t), and Jubilee Blue. Specifically, for the Rolex Day-Date (mistakenly often called President), they list “Blue” (which blue I don’t know), Sky Blue, and Jubilee Blue. Rolex did offer a Diamond set dial in blue, but which blue, I don’t know. The catalog does not list a Diamond set Lapis dial for a Day-Date. This was (after all), 40 years ago, and things change. So the Day-Date was offered with three painted blue dials, and Lapis (the genuine stone), dials. The back side view of the dial shows the chatons that hold the stones to be glued in, not riveted as is most often done on Rolex dials. So I would suggest you need to find out if the stones are diamond, or something else. Since you don’t say the dial was removed from a Day-Date, the first priority should be to find out if it is a genuine Rolex dial! Have someone check the stones to find out what they are. That determination cannot be made from that blurry, out of focus picture.
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