1. The absorption line of jadeite refers to the spectral absorption line emitted when jadeite is detected by infrared spectrometer. Jewelry and jade detection institutions are equipped with infrared spectrometers to detect their absorption spectra. For jadeite, different varieties have different absorption spectra, just as everyone's fingerprints are unique.

2. The absorption spectrum of jadeite is determined as natural and untreated jadeite by infrared spectrometer, which is an important test item in the process of jadeite identification. The absorption spectrum of jadeite is 437nm, which is unique to jadeite. If the detected absorption spectrum of jadeite is not 437nm absorption line, then the jadeite is not real jadeite, but other jadeite varieties, or its physical properties and elements have changed after treatment.

3. In the identification of jadeite, besides understanding the infrared absorption spectrum of natural jadeite, it is more important to look at the identification results. If the jadeite is a natural grade A jadeite, the result will only be marked with the words "jadeite", but not "grade A" and "natural". After the jadeite is taken out, the results will indicate words such as "jadeite (treated)", "jadeite (injected with glue)", "jadeite (B)" or "jadeite (optimized)". However, only natural A goods will issue a certificate that the result is "jade".

It is very important to have a certificate when buying jade ornaments. Every jade article is unique, so the certificate is also unique. The certificate is still tested by the national authority, and such a certificate will not be fake. In addition, observe whether the jade photo on the certificate is consistent with the jade in your hand.