1, Zuo Yan obtained GIA jewelry appraisal certificate and did a lot of research on jewelry.

2. The tourmaline in the live broadcast room in Zuo Yan is authorized by the official copy, and it is guaranteed to be authentic. Tourmaline, the handicraft name of Tourmaline, is a kind of jewelry in Tourmaline family. It is a borosilicate crystal, containing chemical elements such as aluminum, iron, magnesium, sodium, lithium, potassium and so on, showing a variety of colors.