To identify the authenticity of the jade certificate, you should look at the logo, the number, the steel seal, the signature of the inspector and the specific test items. The jadeite industry has always been in trouble. Many jadeites did not understand anything when they first bought jadeite, but they believed in the appraisal certificate of the jadeite they purchased. Therefore, some unscrupulous merchants decided to fake the jadeite. Appraisal certificates have also become the hardest hit area for fraud; therefore, it is important to master the method of identifying the authenticity of jade certificates.

1/ Look at the logo

On a genuine jade certificate, the most conspicuous ones are the logos of several English abbreviations. The most common ones are "CMA", "CAL" or "CAL". The mark of "CNAL" and CMA are the marks of qualified measurement certification of testing institutions. The institutions with this mark are legal testing institutions. CNAL is the symbol of a national laboratory. CAL refers to the standards of testing and inspection agencies approved by the national quality review. Among them, "CMA" is a must. If a certificate does not even have "CMA" on it, it means that the institution that issued the certificate has no appraisal qualifications at all. Such a jade appraisal certificate is a fake certificate.

2/ Look at the number

A valid certificate will have a number on it. This is an important indicator for checking the authenticity of the certificate. There are many fake certificates that deliberately do not write the number, just to prevent We checked the number and found out the authenticity of the certificate. The value of a certificate without a number is equivalent to a piece of blank paper.

3/ Look at the steel seal

The seal on the jade appraisal certificate must be a steel seal, and the writing on the steel seal must be clearly identifiable.

4/ Look at the signature of the inspector

To issue a formal jewelry and jade quality inspection certificate, there should be two signatures, one of whom must have the jewelry and jade quality of the People's Republic of China. The signature of the inspector (registered), the registration is within the validity period, and can only be signed but not stamped (can be printed). Only such inspection certificate has legal validity.

5/ Look at the specific test items

The identification results are the most intuitive, but if you want to have a deeper understanding of the relevant information of the identified jadeite, you should also look at the specific jadeite items, such as each physical, chemical, optical characteristics, etc. Each piece of jadeite should be accompanied by a certificate. The same certificate cannot be used just because it is similar or comes from the same batch of materials.

There are many novices who are very confused about whether the jade they bought is genuine when they first buy a jade bracelet. Although they have obtained the A certificate, they are still not sure. Today I will teach you how to judge. The authenticity of the jade certificate:

The front of the certificate:

1. Shape and color: The shape and color of the jade carving are the most intuitive appearance in front of your eyes;

2. Total mass: the weight of jadeite;

3. Density, optical characteristics, refractive index, absorption spectrum, magnification inspection: these items are several physical characteristics of jadeite, all The data of these items of natural jade are the same, and the authenticity of jade is determined by the agency's detection of jade;

4. Testing basis: the testing standard based on which the testing agency is based;< /p>

5. Main inspection and approval: The signature of the inspector must have 2 or more signatures to be valid;

6. Stamp: It can be clearly seen on the front of the certificate When you see the stamp of the testing agency, there will be a stamp on the authentic and valid certificate;

7. Number: There will be a line of certificate number on the certificate. This is an important certificate to check the authenticity of the certificate. There is no certificate number. Certificates have no credibility.

Observation points: Pay attention to whether the shape and color of the jade sold by the merchant are consistent with those on the certificate. You can also weigh the weight to ensure that the certificate of other jade is not fake.

The back of the certificate:

1. Logo: You will see several logos at the top of the back: CMA, CAL, CNAS. Some certificates have all three logos, and Some have only one, and the CMA mark is a must. If there is no mark or no CMA, then the certificate is not authentic;

2. Organization: There is usually a certificate issued on the back of the certificate The organization will also have detailed information such as address, website, contact information, etc. You can check whether the organization is qualified to issue certificates. If not, the authenticity of the certificate cannot be trusted.

How to identify authenticity?

Check whether the items on the certificate are missing (steel seal, signature of the appraiser, CMA logo on the back, etc.). If there are important items missing, this jadeite Your identification certificate has no credibility;