Because of its scarcity, natural diamonds are not only ornamental and decorative, but also have industrial uses, such as diamond cutting and high-end military industry. They are not widely used because of their high price. In fact, many processing, manufacturing and products are ok. Because of its high hardness, diamonds can be used in sandpaper, drilling and grinding tools, and can be used to cut and describe other substances. However, diamonds used in industry are generally artificial, diamond particles are made of high temperature and high pressure, and natural diamonds are generally used for viewing.