How to judge the authenticity of the jewelry appraisal certificate?

Since the author entered the industry for these years, many relatives and friends have asked if they don’t know how to read the certificate. What makes the author dumbfounded is that some friends say that the certificate must be a good communication between the business and the testing agency, so that they can do what they produce. How? 　　 Since the author entered the industry for these years, many relatives and friends have asked if they don’t know how to read the certificate. What makes the author dumbfounded is that a friend said that the certificate must be a good communication between the business and the testing agency, so they can do whatever they want. ; So how exactly, follow the author to understand. What are the certificates of the testing agencies? The certificates on the market can be described as dazzling and dazzling. Generally, the authoritative jewelry appraisal and testing agencies in the domestic industry include: 　　　　National Jewelry and Jade Quality Supervision and Inspection Center (NGTC)　　　　http://www.ngtc. com.cn/　　　　National Jewelry Quality Supervision and Inspection Center (NJQSIC)　　　　http://www.njc.com.cn/　　　　 Guangdong Province Jewelry, Jade and Precious Metal Testing Center (GTC)　　　　　　http://www.gtc Gold and Silver Jewelry Testing Center (GDTC) http://www.gdtc.cc/　　　　 China University of Geosciences (Wuhan) Jewelry Testing Center (GIC) 　　　　http://www.gic.cug.edu.cn/　　　　 Xiamen Peking University http://www.gdtc.cc/　　　　://www.pkugac.com/　　　　 Zhongwei Quality Inspection (Guangzhou) Jewelry and Jade Quality Inspection Center (CGC) 　　　　http://www.cgc12315.com/　　　　 China Quality Technology (Xiamen) Gold and Silver Jewelry Quality Inspection Center (CQT) http://www.chinacqtc.com/web/Default.aspx　　　　 There are many other testing institutions. Nanjing National Inspection and Quarantine Inspection Bureau and major provinces will generally set up testing institutions. Is the certificate issued by the testing institution authoritative? Merchant collusion, let's understand it together. Take the National Jewelry and Jade Quality Supervision and Inspection Center (NGTC) as an example to explain to everyone. It is affiliated to the Jewelry and Jade Management Center of the Ministry of Land and Resources. It can be said to be a top authoritative organization. You can think about what kind of business has such great power. It is possible to'communicate' with such an organization. Under national supervision, the testing organization only uses equipment and professional knowledge to identify the material of the jewelry and issue a certificate of credibility of the representative organization. (About NGTC, you can search on Baidu to introduce it) 　　　　 Then how do the certificates of other testing agencies know whether they have the qualifications to achieve a certain credibility, and whether they will be copied by criminals? We will take you to understand.　　　　 depends on whether a testing agency can issue an authoritative certificate, whether it is formal, it must be a testing agency recognized by the country, you can see these signs. 'CMA' is the China Metrology Certification https://baike.baidu.com/item/CMA/16481074　　　　'CAL' is the certification symbol of the quality supervision and inspection agency https://baike.baidu.com/item/CAL/1019769　　　　'CNACL' China National Accreditation Service for Laboratories 'CNAS' China National Accreditation Service for Conformity Assessment Generally these marks will appear on the upper right corner of the certificate or on the back of the certificate. NGTC official website qualification announcement. In addition to the official website for checking qualifications, you can also check whether the certificate has been forged ①The chief inspector and the person who verifies are both personal handwritten fonts ②Whether the address indicated on the certificate is consistent with that on the official website and whether the stamp is consistent ③Enter the certificate code, scan the QR code or the barcode to compare the scanned information is consistent with the official website ( If the certificate is not inquired within two days after the certificate is issued, it may be because the test station has not yet uploaded the data) 　　　　④ Whether the logo and spelling on the certificate are consistent. ⑤You can call the official website of each testing station or text message to inquire. ⑥In order to prevent counterfeiting, the testing organization will be replaced For the certificate template, you can follow the official accounts of the major testing agencies to follow the dynamics ⑦In order to prevent being forged, major testing agencies will use some special technologies, such as font fluorescence effects, such as cluster flowers, temperature change anti-counterfeiting and so on. Please pay attention to the location of the NGTC certificate sample. So today, I will give you a brief introduction on how to check the qualification of the testing agency according to the certificate, how to judge whether the certificate issued by the testing agency has been forged. Later, we will introduce you to different types of gem identification certificates. There are some unspoken rules of the industry that are not well known.　　　　 The above is the author's summary of the jewelry identification information for you. The information comes from the Internet. If there is anything wrong, please understand. If you need jewelry customization, please visit the official website of jewelry setting. Jewelry setting will serve you wholeheartedly!