Tourmaline "Tourmaline" is a kind of precious stone with adsorption. Tourmaline is also called tourmaline. It is a silicate crystal mixed with elements such as aluminum, iron, magnesium, sodium, lithium and potassium. Tourmaline, together with natural gems such as ruby, sapphire, aquamarine and emerald, can be classified as colored gems. Tourmaline, the handicraft name of tourmaline, is a kind of tourmaline that reaches the jewelry level. It is a borosilicate crystal, containing chemical elements such as aluminum, iron, magnesium, sodium, lithium, potassium and so on, showing a variety of colors. The English name of tourmaline comes from the ancient Sinhalese word Turmali.