Step 1: Tag (the certificate also depends on the tag)

We can confirm that the testing organization that issued the certificate has passed those special qualifications through the sign on the certificate. The sign that appears on a general certificate is "CMA".

"CMA" is the English abbreviation of China Metrology Certification. It is a comprehensive certification and evaluation of the testing ability and reliability of testing institutions by the metrological administrative department of the people's government at or above the provincial level according to the provisions of the People's Republic of China (PRC) Metrology Law and the National Metrology Law. This symbol only indicates that the organization is a unit that has passed the measurement certification review and is a necessary qualification for any unit that issues a jewelry appraisal certificate. The inspection report marked "CMA" can be used for product quality evaluation, results and judicial appraisal, and has legal effect.

Step 2: Appearance description (look at the model and observe the sample)

The next step is to confirm whether the purchased jewelry and jade are consistent with the samples described in the certificate, including the photos of the samples, the weight on the label and the weight on the certificate, and whether the appearance and description of the jewelry correspond.

Photos are the direct evidence to distinguish different jewels and jade, and the identification certificate photos are clear and accurate, which will greatly increase the difficulty of forgery. However, in some cases, because the jewelry styles are similar and the photo features are similar, it is difficult to distinguish them. In this case, the accurate weight is another valid data that can be verified. In addition to photos and weight, the appraisal certificate will also provide some distinctive appearance features, such as the sugar color of jade, the size of bracelet and so on.

Step 3: Test the content (the most important content).

This step should be the content of the exam that we are most concerned about, and we should know which content on the certificate is the most important.

Grading certificate of inlaid diamonds: the most important thing to pay attention to is the color grade and clarity grade of diamonds, and some certificates also have the cut ratio of diamonds.

Purity inspection certificate of precious metal ornaments: the most important thing is of course the type and content of precious metals.

Jewelry and jade appraisal certificate: the inspection conclusion is the most important. According to the national standard, natural jewelry and jade are no longer marked with the word "natural", but must be marked with artificial processed or synthetic gems, such as: the conclusion is "ruby", which means that this ruby is pure natural; "Ruby (treatment)" means the specific treatment method, which means that this ruby is a natural gem, but its appearance has been improved by some artificial treatment; "Synthetic ruby" means that ruby is not naturally produced, but is purely synthesized by artificial laboratory.

"Remarks" column: Generally, some relatively special samples will be encountered in the testing process, which will be explained in the remarks. For example, in the appraisal certificate of Hetian jade, once the surface treatment is involved, the specific treatment method will be indicated in the remarks.

Step 4: Official seal or inspection mark

In order to prevent the certificate of appraisal institution from being forged, the appraisal certificate must be stamped with the official seal of the unit, and the red official seal as the inspection mark is often not printed with the certificate, but stamped after inspection.

Now some large authentication machines are carrying out heavy anti-counterfeiting. For example, Xinjiang Rock and Mineral Gem Quality Inspection Station added the function of online inquiry in the new certificate issued in 2007. When inquiring, you need to enter the batch verification code and enterprise verification code, which is convenient for consumers to verify and understand the relevant information of jewelry and jade purchased online.

Step 5: Understand the standards.

The general appraisal certificate will also indicate the appraisal and identification standards of jewelry and jade. The current national standards specifically include:

GB/T 16552 name of jewelry and jade; GB/T 16553 jewelry and jade identification; GB/T 16554 diamond classification; GB/T 18043 nondestructive testing method of precious metal jewelry content: x-ray fluorescence spectrometry; GB 1 1887 Rules and naming methods for the purity of precious metals in jewelry.

If you see one or two of these standards on the certificate, you can know what standards jewelry and jade are tested according to. In addition, the certificate should also have the signatures of more than two appraisers and the date of identification of the certificate. Knowing these five parts, you will find out whether your favorite baby is true or not, and if the certificate doesn't match.

Step 6: Understand the basics.