Diamond is the hardest material known on earth, and is called the "King of Gems".
Diamond has a perfect Mohs hardness of 10th grade, which is the hardest material among gems. The carbon content of diamonds reaches 99.98%. These superior characteristics of diamonds are used in waterjet cutting to withstand pressure of up to 90.000 psi. And it will not leave corrosion and abrasion on the surface of orifices. The waterjet impact force is very large. The diamond orifice can resist this impact very well. Its service life is 15-20 times that of ordinary orifices.