1, depending on the qualification: the jewelry and jade appraisal certificate issued has the words CMA, or CAL, CNACL, one of which is valid, especially the first mark CMA, which is the certification mark required by the state. Consumers buy jewelry appraisal certificates with CMA logo, which largely proves the authority of the appraisal certificates used by merchants and the guarantee of product quality.

2. Check the certificate: each jade appraisal certificate has a certificate number and a website. Log on to the website, enter the certificate number, and search whether the certificate is exactly the same as the certificate held in your hand. The contents of the comparison include: jewelry name, photo, color, clarity, total mass, density, refractive index and other items.

3. Quality: The certificate has the accurate gram weight of the identified jade, generally accurate to two decimal places. Use a high-precision electronic scale to measure the gram weight of the physical object, and check whether the gram weight marked on the certificate is completely consistent. If the gram weight is the same as that marked on the certificate, it proves that the certificate is consistent with the real thing. If the gram weight is different from that indicated on the certificate, it must be re-evaluated by a professional organization.

Extended data:

There are many kinds of hetian jade. At present, the most common types of Hetian jade are as follows:

1, Hetian topaz, one of the four main colors of Hetian jade in Xinjiang, is crystal clear, soft as fat, delicate and moist in texture, proud of its yellow color, and its value is not high if it is moist as fat. Its output is very small, comparable to that of suet jade. Hotan topaz has high hardness, reaching Mohs 6.5 degrees, which has high collection value. Hetian jade is mainly produced in granite pegmatite, greisen and high-temperature hydrothermal tungsten-tin chronological veins.

2. Jed Also known as hetian jade. Hetian jade is a rare mineral, which occurs on the northern slope of Kunlun Mountain in Xinjiang. Its chemical composition is hydrated calcium magnesium silicate, and its scientific name is amphibole tremolite, which is referred to as amphibole jade, amphibole jade or amphibole jade. The color of Hetian jade is the best among all kinds of jade, and it is cherished because of its unique jade color.

3. Hetian Jade Guanyin. It is a jewelry accessory made of Hetian jade, or an ornament hanging on the body, or an ornament. Exquisite jade carved from Hetian jade has a unique artistic style, which is a brilliant achievement in the history of human art and a precious heritage of the world cultural and artistic treasure house.

Baidu Encyclopedia-Hetian Jade-Classification