Understanding jadeite certificates is the first lesson in jadeite collection!

Jade is a precious gem bestowed by nature on mankind. Since it was introduced into China more than 400 years ago, it has quickly won the hearts of the Chinese people, so much so that many people regard jade as the national stone. Although jade is produced in Myanmar, it does not hinder its status in the minds of the Chinese people. Wearing jade, playing with jade, or collecting jade, no matter which one, many of our jade lovers are proud to own a piece of jade.

People who have bought jade will naturally know that jade without a certificate should not be purchased casually; however, I also want to tell everyone that jade with a certificate should not be taken lightly: many people know that jade can be real or fake, but few people know that certificates can also be real or fake. There are actually a lot of things hidden in a small jade certificate.

The appraisal committee reminds you: "There are tens of millions of jadeite collections, and natural A-grade jadeite is the first. If you can’t understand the certificate, you will suffer a lot of losses"! Without further ado, the first lesson of the jadeite collection season is - Understanding Jadeite Certificates. Friends are welcome to leave comments to add useful information that Lao Qiu has not mentioned!

There are so many certificates, who is the authority?

Speaking of authoritative certificates, I think of Lianyungang, this magical place that even gives certificates to plastic items costing 200 yuan. Later, the Lianyungang Quality Inspection Institute became as notorious as the amber there. Fortunately, there is little jade in Lianyungang, otherwise... However, there are countless jade certificates all over the country and even all over the world. Which one is authoritative and reliable?

Most testing agencies are relatively reliable, such as the well-known appraisal certificate from the China University of Geosciences, the NGTC appraisal certificate, and the authoritative appraisal certificate issued by the National Inspection Bureau, which can be regarded as the "master" of jewelry appraisal. Of course, the appraisal certificate from the Gem Appraisal Center of Peking University is also very authoritative, but it is of laboratory nature and we don't use it much.

To see whether the institution issuing the certificate is authoritative, we usually look at the certification mark on the certificate. Usually we will see three logos at the top of the back of the certificate: CMA, CAL, and CNAS. Some certificates have all three logos, while others have only one. The CMA logo is required. If there is no logo or no CMA, the authenticity of the certificate is questionable.

A jade identification certificate generally contains nine items: number, verification code, identification result, shape, total mass, color, magnified observation, notes, inspector and reviewer (the names of the inspector and reviewer are generally hand-signed).

Taking the appraisal certificate issued by the Ministry of Land and Resources as an example, in addition to the several logos we just mentioned, there are also several anti-counterfeiting labels on the certificate itself. Generally speaking, it is difficult to forge a certificate.

The anti-counterfeiting mark on the certificate, steel stamp, online query and other methods can all prove the source of the certificate.

Do you understand the contents of the appraisal certificate?

1. The secret hidden in the conclusion

For natural A-grade jadeite, the certificate inspection conclusion column shows jadeite (jadeite pendants, jadeite pendants, etc.), proving that the sample is natural jadeite without any artificial treatment.

Some certificates will also state "Jade (A Grade)".

For non-natural jade B and C goods, the certificate’s inspection conclusion column shows Jade (processed), proving that the sample is made of jade, but has undergone non-traditional artificial processing methods that are not yet widely accepted. The treatment methods listed in Table B.1 of GB/T 16552-2010 Names of Jewelry and Gemstones include dyeing, bleaching and filling, and coating.

The specific method will be noted in the remarks column to clearly inform consumers how the jade is processed.

For other imitation jadeite, such as spliced ​​jadeite, the inspection conclusion on the certificate shows spliced ​​jadeite, while the internal structure information will be shown in the magnified inspection column; for reconstructed jadeite, the conclusion of reconstructed jadeite will be shown, and its characteristic internal structure will be indicated in the magnified inspection column, such as "see grain boundaries".

2. The secret hidden in the "Remarks" column

The conclusion column is a point that many people pay attention to. When seeing the conclusion is A-grade, many treasure friends will ignore the "remarks". In fact, these problems will also appear in the remarks column:

Sample contains polishing powder

The finished jade products have to go through processes such as polishing and waxing. Polishing powder is a material used in these processes. It can polish the surface of jade smooth and flat, and it is the most common processing tool.

However, some unscrupulous merchants will tamper with the polishing process in order to sell at a high price. For example, they will dye the polishing powder with a dye before polishing, and deliberately omit the cleaning step... The jade produced in this way is more beautiful than the original color, easier to sell at a high price, and is very deceptive.

Sample origin uncertain

Some treasure owners have reported that such notes will appear on the appraisal certificate. Such remarks are often seen on red jadeite, which means that this piece of red jadeite has been heat treated, which is an optimization method recognized by the industry and is also considered natural A-grade jadeite.

Contains other mineral ingredients

This does not mean that the jade is fake, it’s just that the composition of this piece is more complex and it still belongs to the category of natural jade.

Pay special attention to whether the certificate and the actual object are consistent. Natural jade generally has one certificate for one object, and the two must correspond.

1. Marked with "CMA" or "MA". Institutions with this mark are national legal inspection institutions.

2. "CAL" mark. The prerequisite for obtaining CAL certification is to pass CMA certification, indicating that the institution has obtained the review and approval of the Certification and Accreditation Administration of the People's Republic of China or the quality and technical supervision departments of the people's governments of provinces, autonomous regions, and municipalities directly under the central government.

3. The mark "CNAS" indicates that the institution has been accredited by the China National Accreditation Service for Conformity Assessment.

4. "ILAC-MRA" is an international mutual recognition mark. The test results with this mark can be mutually recognized by 56 laboratory accreditation bodies in 46 economies in the world.

5. Other marks: The “CIBJO” mark is the standard of the International Jewellery Federation, and the “GIA” mark is the standard of the Gemological Institute of America.

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