1. Is there a capitalized "CMA" national metrological certification mark on the first line of the jadeite appraisal certificate? Note that c contains "ma"; It also depends on whether there are two kinds of accreditation: "California Institute of Technology" and "CNAS" laboratories.

2. In order to have legal benefits, the appraiser must sign on the back of all legally issued certificates, and it must be two or more signatures. One is the signature of the appraiser, and the other is the signature of the inspector.

3. Look at the specific test items on the jade appraisal certificate. Let's see if the appraisal result is jade (A goods) first. If it is jade A, it will be accompanied by the words "jade handle", "jade pendant" and "jade bracelet". If the appraisal result is not A goods, the result will be written as "optimized jadeite" or "processed jadeite" and so on.

4. Retrieve the certificate to determine the authority of the certificate. Weighing, accurate to two decimal places, corresponding to the gram weight marked on the certificate, must be exactly the same.

This will be foolproof.