A testing organization named Shenzhong Gold, Silver and Jewelry Testing Center has all kinds of testing equipment, official seals and steel seals, and found a large number of suspected forged appraisal certificates, with the number reaching 200,000. Among them, CNAS (National Accreditation Mark of China Laboratory) in a certificate was actually written as "CNZS", and the registration number noted after inquiry was also fictitious.

Traditional jade counterfeiting methods can be roughly divided into three types: shoddy, fake and shoddy, and artificial jade products.

Extended data:

Identify the authenticity of the authentication certificate

The first is to see if the inspection agency is legal. The state has strict qualification requirements for jewelry and jade quality appraisal institutions, and the appraisal certificate issued is only valid if it passes the review. CMA, CAL and CNAS are common in the certificate of jewelry and jade appraisal.

According to reports, CMA is a sign that the measurement certification of testing institutions is qualified, and the institutions with this sign are statutory inspection institutions. According to the relevant provisions of People's Republic of China (PRC) Product Quality Law.

Institutions engaged in social testing and inspection of products within the territory of China must be qualified by the national or provincial metrological certification management department in conjunction with recognized institutions, and can engage in testing and inspection activities only after being established or authorized according to law;

CAL is the symbol of inspection institutions recognized by national quality inspection, and institutions with this symbol are qualified to make arbitration inspection conclusions. Having CMA mainly means that the testing personnel, testing instruments, testing basis and methods are qualified, and the premise of having CAL mark is that the measurement certification is qualified, that is, having CMA qualification.

Then the quality management conditions of the mechanism also meet the requirements, so it can be considered that the working quality and reliability of the mechanism with CAL are further improved than that with CMA only; CNAS was recognized by China National Accreditation Committee for Conformity Assessment.

CNAS is a combination of CNAB and CNAL, which supports international mutual recognition.

Any of the above three marks is valid, especially the first mark CMA, which is the basic requirement of national laws for testing and inspection institutions.

The second is to look at the content of the exam. Including the name, color, purity, total mass, density, refractive index and other items of the goods submitted for inspection, these items are very strict in the nationally certified jewelry and jade testing institutions.

Third, look at the signature of the appraiser. The appraisal certificate must be signed by two appraisers to be valid: one is the appraiser and the other is the reviewer.

In the meantime, I have to look at the seal. Strictly speaking, it should be a steel seal, and the font on it can be clearly recognized.

Finally, look at the numbers. There is the serial number of this certificate on the back of the appraisal certificate, which should be consistent with the serial number posted on the back of the physical object.

In addition, some certificates have numbers, which can be queried on the website or through SMS. If it is genuine, you can definitely find the style you bought by entering the number.

Some organizations also have special anti-counterfeiting measures. For example, the certificate issued by Guangzhou Zhonggong Jewelry Testing Center has special shading and anti-counterfeiting marks.

References:

People's Daily Online-False certificates of jewelry and jade emerge one after another. Experts teach you how to identify the authenticity of certificates with the naked eye.