Jade Certificate

With the advent of the Mid-Autumn National Day, the purchase of jade and other jade jewelry as a gift for relatives and friends has become the first choice for many citizens. However, people often find it difficult to understand the authentication certificate when purchasing. In response, the reporter took you to visit the market and conducted a survey on all aspects of the jade identification certificate.

The most important aspect of an identification certificate is the identification result. To invest in jadeite, consumers must first understand what the experts call the "A, B, C, D" concept. The so-called A cargo is a natural jadeite that represents its internal structure without any artificial processing. The B cargo uses strong acid to remove the natural jadeite impurities. The C cargo is its color is artificially dyed, and the D cargo is made of other jade or glass. Emerald. In fact, both B and C have destroyed their natural structure, but they will look beautiful, and wearing it for a long time will also bring about some negative effects on your body.

The Emerald certificate issued by the national authority is one of the identification results. If it is a natural A cargo jadeite, the result is only the word “Jade”, and the words “A cargo” and “natural” will not be marked. This is because only a natural A product will issue a certificate that results in “Jade”, and if it is a B product, an identification result in the certificate will indicate “Emerald (Processing)” and “Jade (Gum)” or Emerald (B) or Emerald (Optimized). C cargo jade will be marked "emerald (dyed)." In the identification certificate results, D-item Jade will not appear "emerald", what substitutes will indicate the name of such substitutes, such as "artificial glass", "dyeing quartzite," "Saiyu," " Malay jade" and so on.

Second, the certificate should be a one-to-one correspondence, that is, a piece of a certificate, and the certificate should have a picture and weight of the item. Although some things come from a piece of Raw Material, the appearance looks very similar, but the jadeite jewelry is not exactly the same, a thing that does a certificate does not prove the quality of the entire batch. In order to save costs, some businesses only have one certificate as a sample. The goods and objects on the photo are also similar. This does not determine that the batch of goods they sell is natural. This does not comply with the state regulations.

Third, there should be some basic physical, chemical and optical characteristics of jadeite on the certificate. The general routine appraisal only authorizes the inspection conclusion, quality, coding, inspection date, etc. of jewelery and jade, and has the seal or anti-counterfeiting mark as well as the national anti-counterfeiting inquiry telephone, the names of the inspectors, auditors, and approval personnel and the inspection institute. The website discloses the status of the seized items. However, authoritative and standard testing organizations generally perform multi-item identification for jewelry such as jadeite, such as quality, shape, color, density, refractive index, absorption spectrum, magnification inspection, coding, and inspection date.

There are several unique test standards for jade that are worthy of reference. Refractive index: 1.66 (This is a unique index of refraction of Jadeite that is unique to other precious stones); Density: 3.33 (also a distinguishing feature of Jade from other precious stones); Magnification test: Fiber intertwining structure (This is a structure unique to Emerald) Absorption spectrum: absorption line at 437 nm (absorption spectrum unique to jadeite); color filter inspection: no reaction (some stained jadeite will turn red under color filter); lightness: aggregate (emerald is a micro mineral aggregate); fluorescence : None (some B products will have a fluorescent reaction after glue injection); Appearance characteristics: glass luster (some B goods will show a waxy luster).

It is understood that the two most authoritative organizations currently in Hefei are the Hefei Mineral Resources Supervision and Inspection Center of the Ministry of Land and Resources and the Baoyu Stone Quality Supervision and Inspection Station of the Anhui Gold and Silver Ornaments. It is necessary to remind you that there are many companies that issue certificates that are not state-authorized. Such certificates may be compromised in accuracy and authority. According to the Chinese Baoyu Stone Association's 2004 No. 001 document, sampling results across the country showed that at least 19 certification organizations issued certificates that deliberately raised the quality of diamonds, identified quartzite as jadeite, and some of them identified There are a large number of unqualified tests. These problems are not limited by the level of detection, but they are for the sake of certain people. This is more of a concern for consumers.