The national standard has listed some filling treatments of tourmaline as optimization. The certificate shown in the above picture is issued by Guangdong Jewelry, Jade and Precious Metals Testing Center, with CMA, CAL and CNAS standard certification marks. Pay attention to the verification of certificates. Sometimes forged certificates can be found online, so carefully check the pictures and objects on GTC official website in China, certificates and online appraisal results. Natural tourmaline can be divided into filled tourmaline and unfilled tourmaline. Because the filling of tourmaline is optimized, it will not indicate whether tourmaline has been treated or not. If tourmaline is filled in the certificate, it will be noted in the remarks: "partially visible filling phenomenon", and the remarks refer to partially visible filling phenomenon, indicating that one or part of the beads have been filled.

Tourmaline is a kind of tourmaline that can reach the jewelry level. Tourmaline is a borosilicate crystal, which can contain elements such as aluminum, iron, magnesium, sodium, lithium and potassium. It is because of these chemical elements that tourmaline can show various colors. The English name of tourmaline comes from the ancient Sinhalese word Turmali (), which means "mixed gem".