The answer is simple. Only diamonds can cut and grind diamonds. In other words, these tools for cutting and polishing diamonds have a certain service life, and after a period of time, they are destroyed and can no longer be used.
From the physical point of view, diamond fire color consists of external fire color, internal fire color, dispersed fire color and flash fire color. Fire color is an important embodiment of the beauty of diamonds, but good fire color can only be achieved through precise processing. The main reason for processing rough diamonds is to show the beauty of diamonds to the greatest extent.
In the traditional process, the saw drill (cutting the original stone into blocks) is to clamp the original stone on the machine, rotate it at high speed with an ultra-thin copper sheet (like a circular saw blade), then touch the original stone and cut the line along the defined division. This process is very slow, and the saw blade (copper sheet) is extremely worn, but this method is still widely used in today's large-grained diamonds because it is the safest.
The cut diamond must be screened, then sent to the rough grinding department, glued to the cylindrical fixture, and then rotated around the axis of the fixture, and the grinding wheel contacted from the side to grind the diamond shape: round waist line, conical pavilion, inclined stepped crown. A * * * should be polished twice, and the grinding wheel used must be a ceramic diamond grinding wheel, because it has good shape retention and sharpness. After rough grinding, the rough diamond should be inspected and screened, and then sent to the faceted polishing workshop, where the diamonds are held on a hand-held fixture (in jargon, it seems to be called an eight-claw hand) at an angle, and then polished on a horizontally rotating cast iron or cast steel grinding disc. The grinding disc will be coated with a layer of diamond powder with a particle size of less than 5 microns in advance (coated with diamond powder mixed glue or directly electroplated), and cut and polished one by one until all facets are 10.
It can be seen that cutting the hardest diamond in the world requires not only advanced equipment, but also rich experience, high sense of responsibility and the concentration of the cutter to release all the brilliance of the diamond.