Questions, answered plainly.

Wrap a tape measure around your wrist just below the bone, then add 1.5 cm. S is 17 cm, M is 19 cm, L is 21 cm. Most men wear M.

Not quickly. It is 18k gold PVD, five microns thick, bonded under vacuum rather than plated on.

Shower, yes. Swimming pools, no — chlorine is the one thing that dulls a PVD finish.