Sapphire glass (SAPPHIRE CRYSTAL) generally refers to artificially synthesized sapphire, which is very different from the commonly understood jewelry - natural sapphire, and is generally used for the manufacturing of watch mirrors. It is wear-resistant material along with tungsten titanium alloy and high-tech ceramics. Although these materials can resist wear and tear, they cannot withstand strong impacts, and some substances with the same or higher hardness (such as grinding stones, sandpaper, nail clippers, granite surfaces, concrete walls and floors, etc.) may scratch the surface of these materials. Sapphire glass is a general term for corundum gems of other colors except red Ruby, and the main component is aluminum oxide (AlO). Sapphire glass refers to artificially synthesized sapphires, which can be easily and cheaply produced in the laboratory to produce gemstone grade sapphires with the same chemical composition and physical properties as natural sapphires.