Every single part in a watch is important, including glass. The glass protects movement of your wristwatch from dust: this is very important because just one particle of dust can destroy your wristwatch completely. Glass protects not only the movement, also glass protects the dial of the watch from mechanical damage. Thus you understand that a watch, no matter if it is aan original watch or a replica timepiece, ought to have good glass. There are three main sorts of wristwatch glasses: acrylic glass, mineral glass and sapphire crystal. None of these types of glass is really excellent, each of them has its good characteristics and disadvantages. Acrylic glass is usually used in cheap watches (http://www.replicator.co). Though acrylic glass is very inexpensive, it is very hard to break, so it is often used in sports timepieces. Since being very low priced, acrylic glass is often used in copy watches, for example in Panerai copy timepieces. Many customers do not like acrylic glass, because it is very easy to scratch such a glass. Well, there is a really nice solution - scratched glass can be easily replaced with new one. Mineral glass is also used in copy Panerai timepieces and other kinds of replica watches, because it is inexpensive enough. However, mineral glass is harder than acrylic glass. Like acrylic glass, mineral glass can be scratched, however, it is harder to scratch. Mineral glass is successfully used in production of wristwatches that is why it is often called "ordinary glass". If you wish to possess really scratch-resistant glass, you ought to opt for a wristwatch with sapphire crystal glass. Wristwatches with sapphire crystal are very expensive, these are usually watches by the most prestigious Swiss or German brands. Sapphire crystal is not perfect - it is scratch-resistant, but it is very easy to break. Keep your wristwatch away from damage and the crystal will serve you for the longest possible time. Take into consideration the fact that even the hardest glass can be broken. If the glass is broken you should stop your watch and take it to the service centre.