Rolex Datejust 36mm Blue Index on Jubilee 1262344Overview The 36mm Datejust is the dimension the reference launched with in 1945 and has maintained as its core specification ever since not because Rolex hasn't explored other sizes, but because 36mm sits at the precise point where a dress watch functions across the widest range of wrist sizes and contexts. The 126234 in blue with a fluted 18 carat white gold bezel is the most historically consistent configuration of that argument: the pairing of