The sapphire mirror installed on the watch is actually aluminum oxide with impurities such as iron oxide and titanium oxide removed. Chemically speaking, there is no difference between synthetic sapphire and natural crystal. Because no other elements are added, it is colorless and transparent. There is no "blue" color. Aluminum oxide is made of pure aluminum oxide at high temperature to make the original synthetic sapphire, which is then cut into discs by diamond tools, and then polished into a watch mirror. Due to the high cost of processing tools, this is one of the reasons for the high cost of sapphire crystals. The technology of synthetic sapphire was invented in the 19th century and has been used in watches since the 1960s. Now top watch brands generally use sapphire crystals.
First, it will not be scratched. Sapphire is very hard and is an inevitable choice for top watches. However, like glass, it is brittle and easily broken. Therefore, once this sapphire mirror is broken, the maintenance costs incurred will be very expensive, because the watchmaker must carefully check to ensure that no sapphire fragments are left in the movement before replacing the lens. In addition, it is a powerful fingerprint collector, so it needs to be wiped frequently to be bright. Whether it is natural sapphire or synthetic sapphire, it is one of the hardest substances on the replcia Rolex earth, with a hardness of 9 on the Mohs level. In nature, apart from diamonds, there is nothing harder than it. Note that it is said that there is no in nature, not that there is no on earth. Some man-made silicon-carbon compounds can reach 9 levels of hardness and can scratch sapphires. Many construction and decoration materials also use silicon-carbon compounds, such as artificial stone, etc. Therefore, if friction occurs in these places, it is possible to leave scratches on the sapphire crystal.
A sapphire crystal of the right size, but this will also destroy the waterproof performance of the watch. In addition, the result of this is that many manufacturers will refuse to provide maintenance for your watch.
First, you can tap your finger on the mirror and listen carefully. Acrylic mirrors make a sound like plastic, while glass makes a thicker sound. Secondly, from the perspective of weight, the acrylic mirror is the lightest and the sapphire mirror is the heaviest. Because sapphire has a good thermal conductivity, it will feel cold when replica watches you touch it with your hands. Since the mirror surface of sapphire is much smoother than the mirror surfaces of the other two materials, if you drop a drop of water on the mirror surface of the sapphire, the water droplets will not spread easily, while the other materials will disperse into one piece, but it is not absolute. Or take the watch to a professional after-sales repair point for a technician to help check it.