PVD=Physical Vapor Deposition, is a process where materials are made more scratch-resistant and resistant to corrosion.
Unless otherwise noted all CONTINENTAL watches are made of high-grade stainless steel.
It is a synthetic manufactured crystal which is extremely scratch-resistant. Only diamonds are harder.
The water-resistance of your watch should be checked regularly and especially after a change of the battery. The gasket can be affected by ageing more rapidly because of large fluctuations of temperature and accidental shocks.