"Factory diamond dial" and "Style number"...Help please!

[economist1974]

Hello,

I am contemplating about buying a used Datejust with a diamond dial. However, I am not sure if the diamonds are in fact "Rolex factory" (as claimed by a seller) or "aftermarket" (in which I will be disappointed).

Can we tell if the watch has a "factory diamond dial" from the "style number" printed on the warranty paper?

For instance, I have two style numbers here:

R1623336VB6252

R1623332GB6252

Did the above numbers tell us anything about the dial?

Please please help! Thank you so much in advance.