Horological Meandering

Water resistance rating on a DateJust is 100 meters, correct?

Hodinkee, for all its flaws, did a neat profile of a woman who has been diving for decades. She dives with a yellow gold dj36 and has for years.

The 1601 is rated 50m - I pressure test it to 100m - no problem. And I have been diving with it too.

Here's a little more information. From the official Rolex website : All Oyster Perpetual models are equipped with the Oyster case, providing the movement with optimal protection against water, dust and shocks. Before being shipped, every Oyster watch is i... 

I do not know if I would dive with it however. WR is an odd thing. They test the watch to static water pressure of whatever it is. But, any motion of the water drastically increases the effective pressure. Thus, watches certified to 30 meters WR should be...