Introduction of hardness pen
The hardness of a gemstone refers to the ability of the gemstone to resist scoring, pressing and grinding of foreign objects.
The hardness of a gemstone is an important factor determining the value of the gemstone.
When two minerals with different hardnesses scratch each other, they will leave scratches on the surface of the minerals with lower hardness.
Physical scratch test
This method is based on the comparison between the engraved gemstone minerals and the standard hardness minerals.
The hardness difference between two adjacent standard minerals is different.
The difference between corundum and diamond is large.
The Mohs hardness pen is 5 # apatite, # 6 orthoclase, 7 # quartz, # 8 Topaz # 9 corundum
in the Mohs hardness tester set on five heel metal rods respectively.
Use the edges and corners of these ore to score the sample to be tested.
According to whether there are scratches on the sample to determine the hardness of the sample:
If scratches are left, it means that the hardness of the sample is lower than the hardness of the hardness pen.
If it cannot be moved, the hardness of the sample is higher than the hardness of the hardness pen.