onzenuub 307 Posted July 3, 2009 Watch Crystal Watch crystal is a transparent cover that protects the watch face. Material : Acrylic Glass / Plexiglass Glass /Mineral Glass Synthetic Sapphire Advantages and Disadvantages of each material : Advantages Acrylic Glass / Plexiglass cheap least likely to shatter Glass /Mineral Glass scratch - resistant Synthetic Sapphire most scratch resistant Disadvantages Acrylic Glass / Plexiglass most likely to be scratched Glass /Mineral Glass more likely to break Synthetic Sapphire most expensive Synthetic Sapphire One of the hardest substances on earth. It measures 9 on the Mohs scale - Diamond measures 10, the highest rating. However, if struck sharply and from the correct direction, sapphire will shatter. Remove the scratch on Acrylic Galss / Plexiglass - Caution ! No guarantee ! Try on your own risks ! 1. Put some toothpaste on the Acrylic Galss / Plexiglass and rub it gently with a soft damp cloth. 2. Put some Brasso on Acrylic Glass / Plexiglass and rub it gently with a soft dry cloth. Share this post Link to post Share on other sites