A diamond scratch tool, also known as a diamond scribe, is a tool used in material science and engineering to scratch or score the surface of a material. The tool typically consists of a small diamond tip that is mounted on a handle.

The diamond scratch tool is primarily used to determine the hardness of a material. By scratching the surface of the material with the diamond tip, the tool can leave a visible scratch that can be measured and compared to other materials. This is known as the scratch hardness test, and it is often used to rank the hardness of minerals on the Mohs scale.

Diamond scratch tools are also used in the semiconductor industry to scribe or cut silicon wafers. The tool is used to create a groove or scratch on the surface of the wafer, which is then broken along the groove to create individual chips. This process is known as dicing or scribing, and it is a critical step in the production of semiconductor devices.