Domed sapphire glass
The crystal on the Concordia is unique: The challenge was to create an ultra-resistant watch that remains easy to read. We have therefore chose a sapphire glass, anti-glare, only 3 millimeters thick.
The sapphire glass is a very resistant component, it is the second hardest material after the diamond (it is for example 7 times harder than the hardened steel). Thus sapphire is hard to break or to scratch and will withstand the challenges of time.