For the sake of their own rights and interests, individual institutions have taken anti-counterfeiting measures on certificates, such as anti-counterfeiting codes, laser anti-counterfeiting labels, NGTC ultraviolet visible marking fluorescence and so on.
Authentication certificate authenticity basis:
1. All certificates are made of plastic and stamped with steel seal. The text is typed by machine and signed by most examiners and reviewers.
2. All certificates adopt one certificate and one number, that is, each certificate has its own unique certificate number. Even if the fake certificate uses the number of the real certificate, the relevant information found on the Internet does not match.
3. The sample of the real certificate is consistent with the photo of the certificate. The total quality on different certificates is different. Compared with the total mass on the certificate, the weight error of samples below 200g is generally less than 0.02g.. ..
4. The address, contact information and website address on the certificate are the same as those on official website, which can be found on official website.
5. Look at the "color" item on the certificate to see if the description is consistent and accurate. This item that says "true colors" is a false certificate.
6. The item "Appraisal Result" on the certificate will include the name of the jewelry type. No matter what kind of sample it is, the jewelry type will be added after its name, such as "Emerald (A) bracelet" and "Blue gem ring".
7. You can search the testing organization on the certificate online, and then find the certificate query website of the testing organization to identify the authenticity of the certificate, instead of directly querying the authenticity of the certificate according to the website printed on the certificate.
8. There are legal certification marks such as CMA, CAL, CNAS and the certification certificate of the certification number authority, among which CMA is the necessary symbol of the testing institution. Many testing and inspection institutions have the above three marks at the same time. With the identification certificate of the three marks, there will be "three risks".
Extended data:
One of the factors to judge whether the institution issuing the certificate is authoritative: domestic formal jewelry testing institutions will be restricted by national supervision and laws, so first of all, on a jewelry appraisal certificate, we will definitely see some or all of the following signs:
1、? CMA is the abbreviation of ChinaMetrology Accreditation.
It is the statutory compulsory certification of testing institutions by the state, and it is the symbol of qualified measurement certification of testing institutions. This sign shows that the testing organization is legal, with qualified testing equipment, personnel qualifications, workplace, testing conditions and sound management rules and regulations.
2.CAL stands for China accredited laboratory.
CAL mark is a special mark of qualified inspection institutions established or authorized by quality and technical supervision departments according to law.
3.CNAS is the abbreviation of China National Accreditation Committee for Conformity Assessment.
This mark represents that the inspection institution has passed the examination and approval organized by China National Laboratory Accreditation Committee.
? Baidu Encyclopedia-Jewelry Appraisal Certificate