A crystal is a solid material commonly used in glassware, jewelry as well as a component in various electronic devices such as digital watches. Crystals generally have transparent or translucent properties and can have a wide variety or colorations.
About Square Watches:
Square watches are watches that have a square case design. Square watches may have any variety of material or design on the wristband, as long as the case, or face, of the watch is square in shape.