There is an error in the weight on the jade certificate. For the jade bracelet shown in the picture, there is no problem! The reason why the weights of the three times are different is that when the landlord looks carefully, they are all in the second place after the decimal point, which is caused by the lack of weighing equipment and accuracy. Weighing with a high-precision jewelry scale, the value does not fluctuate.

, enter the query URL on the back of the certificate, and query whether the certificate is consistent with the certificate map on the network according to the operation prompts. 2. Inquire whether the issuing agency has national qualification certification. 3. Weigh the bracelet with an accurate jewelry scale. If the actual gram weight of the bracelet is equal to 779 grams marked on the certificate.

Under normal circumstances, the electronic weighing of different testing institutions will have errors. Some institutions are lazy and often no one calibrates them. In this case, the quality error of different institutions will be 0.XXg.

Water: High transparency and bright water permeability mean good water head. Generally, good plants have good heads. Poor transparency, opacity is suitable for dry head. Defect: no crack and no defect is the top grade. With black, dirty and cracked vitamins times. Few jadeites produced in nature are perfect. Technology: exquisite design, fine workmanship and careful polishing are better.

The difference is so big that it is likely that the certificate is fake. Usually at least the weight can't be wrong.