Quartz - in a quartz movement, electronically controlled oscillations are transmitted by a specially designed synthetic quartz crystal. The precision of the oscillations is the reason for the high accuracy of quartz movements. Energy is derived from a battery.
Water-resistant up to a pressure of 10 bar (100m/330ft).
316L stainless steel with PVD coating.
Sapphire crystal - scratch resistant crystal based on high-quality aluminium oxide; up to seven times harder than steel (hardness: 2200-2300 Vickers).