Simply judge whether the jade appraisal certificate is authoritative and true from the following aspects:
1. See if the first line of the certificate has "CMA" national metrology certification mark, and C contains "MA"; Whether there is "CAL" national quality supervision, examination and approval. CMA's test of CNAS certification is basically similar to CAL's calibration of CNAS. The former is a characteristic of China, while the latter is an international practice.
CMA is the abbreviation of China Metrology Certification. A testing institution that has obtained a certificate of laboratory qualification (metrological certification) may use the CMA mark on the certificate of testing (testing) and report according to the items listed in the certificate.
Mark CAL: It is the certification mark of quality supervision and inspection institutions and the authoritative mark granted by the state. CAL is an administrative act that the quality and technical supervision department, according to the provisions of relevant laws and regulations, authorizes or establishes an inspection institution to undertake product quality inspection according to law, rationally plans and defines the scope of inspection tasks, and allows it to undertake statutory product quality inspection after evaluating its notarization and technical capabilities.
CNAL was formed by the merger of the former China National Accreditation Committee for Laboratories and the former China National Accreditation Committee for Entry-Exit Inspection and Quarantine. CNACL and CCIBLAC are full members of Asia-Pacific Laboratory Accreditation Cooperation (APLAC) and international laboratory accreditation cooperation (ILAC). And signed ILAC-MRA (Mutual Recognition Agreement) and APLAC-MRA (Mutual Recognition Agreement).
2. All legally issued certificates are signed by appraisers on the back, and they must be signed by more than two people to have legal effect. One is the signature of the appraiser and the other is the signature of the inspector.
3. Finally, look at the testing items of the appraisal certificate. Let's see if the appraisal result is jadeite (A goods). If it is a goods, it will be attached; If it is not A goods, it will be written as "optimized jade bracelet" and other types.
In addition, you can also query in the following ways:
1. Network query. In the era of network information, jade appraisal institutions keep pace with the times. Basically, regular jade appraisal institutions will set up their own websites on the Internet to provide you with the authenticity of their own appraisal certificates. If the consumer takes a fake appraisal certificate, there is no information in the website. Generally speaking, the website query entrance will be in a conspicuous place, just as you will see it when you open the website. If it is fake, it is natural.
2. Scan the QR code to identify. With more and more smartphones and more WeChat users, sweeping has become the most talked about topic. The so-called scanning means scanning a two-dimensional code, and one two-dimensional code corresponds to one content, and the two-dimensional code has a large amount of information and strong anti-counterfeiting ability, so the two-dimensional code is rarely fake.
3. Then scan the QR code to enter the website, and all the information of this appraisal certificate will be displayed on the webpage, and then compare the real object with the picture to determine the authenticity of the jade. However, not all jade appraisal institutions have two-dimensional code appraisal, so the two-dimensional code inquiry is only applicable to some institutions with two-dimensional codes.
Extended data:
A goods are pure natural jadeite, only carved and polished. There is no chemical treatment, no artificial forgery such as high temperature and high pressure. It is a natural color, which is called "positive color" or "true color" without dyeing or electric color. Visually, the texture is delicate, the color is soft and the stone lines are obvious; Slight impact, crisp and pleasant voice; It feels very heavy and is obviously different from other stones. It is characterized by a density of 3.32-3.34g/cm3, a refractive index of 1.66, a glass luster, a fiber interwoven structure under enlarged observation, and no fluorescence under ultraviolet lamp.
References:
CMA (China Metrology Certification) Baidu Encyclopedia
CAL (Certification Mark of Quality Supervision and Inspection Organization) Baidu Encyclopedia
CNAL？ Baidu baike
A cargo of jade? Baidu baike