... also obtain ISO 9001 quality system certification. Our market is covering the United States, Middle East, Asia, Europe so on. ... or diamond.2Color Perfectstone Quartz is suitable in 50 colours. It is difficult not to find the appropiate color for any ... scratches.Taking in consideration the Mohs hardness scale, the position of the quartz is 7 (diamond is 10). Therefore, using the same knife in different ...