First, first of all, the thermal conductivity meter can only distinguish imitation diamonds from diamonds, but can't distinguish mosan from diamonds. If it is the first time to use it, it needs to be warmed up for one or two minutes, and then the probe is pressed slightly perpendicular to the diamond table. If there is a buzzer alarm, it can be judged whether the measured sample is diamond or mosan stone, and then the mosan stone measuring instrument can be used to distinguish diamond from mosan stone. The use method is the same as that of thermal conductivity meter.

Second, the thermal conductivity meter can't measure jade, jadeite, crystal and hardness. A treasure mentioned above can measure jadeite, jadeite, jade crystal and hardness with a thermal conductivity meter, which is all a bluff! Never believe it!

Third, the hardness pen is only a mineral hardness pen, which belongs to destructive testing. When testing the hardness of gemstones, we should first predict the hardness of the samples to be tested, and then select the inconspicuous parts of the samples to be tested for marking. If there are scratches, it means that the hardness of the sample to be tested is lower than that of the hardness pen, otherwise it is higher.

Finally, I recommend a professional jewelry instrument company to you and check the brand of ZHO Zhuanghe. I wish you progress in your study!