Diamond is the only one of the highest hardness sets, strong index of refraction and in the integration of high-dispersive gemstone varieties, are unparalleled in any other gem varieties.
钻石是唯一一种集最高硬度，强折射率和高色散于一体的宝石品种，任何其它宝石品种都是不可比拟的。
2
Diamond CVD coating process is introduced to increase the surface hardness of cutting tools.
为增加切削刀具表面硬度引入了钻石化学蒸发沉淀涂层工艺。
3
At the same time, some of the same or higher hardness material, such as diamond, corundum, metal oxide, quartz crystals are likely to damage the material.