THERE ARE THREE BASIC DIAL COVER TYPES USED FOR A WRISTWATCH:
Possessing the same chemical composition as natural sapphire, this is the most expensive and hardest type, and widely used in Swiss watches.
Mineral crystals are simply made of glass. Inexpensive but relatively easy to break. This
This is the most affordable kind but not as resistant to scratches. This material is also known as acrylite, and is technically considered a type of plastic.