Yes and no. Your statement is sort of a generalization that overlooks a few things. Yes, Cartier is a jewelry company and started out as one, but they have been making wrist watches since before Rolex existed. They have also made some great contributions to the watch world (single pusher chronographs, mystery clocks, deployant clasps, and for years they have offered watches that are far more complicated that what Rolex makes). As for the movements, yes Rolex can say all of their watches have movements that they make, because they label their entry level watches as a different brand...Tudor (in which case they buy the movements from other suppliers). Cartier's entry level watches often purchase movement from other companies, but they do make many of their own movements particularly when they are complicated watches or very high end. In addition, when you get into their higher end watches (the movements they make or have in the past purchased from JLC, Piaget, THA and others) are much more finely finished than anything you will will find in a Rolex.
Also, Cartier currently produces more watches than almost any other watch company besides Rolex (Rolex makes more than a million watches per year).
I have watches from Rolex and Cartier and both are great. Just different.
