Topaz, also known as topaz by mineralogists, is often called topaz in the domestic jewelry industry, which is an English transliteration. This is mainly because both topaz and topaz will be confused with the original names of some gems in China's jewelry industry. In China, yellow hetian jade (nephrite) has long been called topaz, especially in the field of archaeology; Topaz is easily mixed with topaz in crystal.

Topaz is also a fluorine-containing aluminosilicate mineral, which is formed by the steam discharged during the crystallization of igneous rocks and generally occurs in the pores of rhyolite and granite. Because it is often associated with tin ore, it can be used as a sign to find tin ore. Topaz is generally columnar or irregular granular or massive, with various colors, such as yellow, blue, green, red, brown, etc., with glassy luster, and some are colorless and transparent. The color of topaz will fade when exposed to the sun for a long time. Topaz can be used as grinding material and instrument bearing. Transparent and beautiful topaz is a precious gem.

Origin: Brazil, Sri Lanka, USA, China.

Chemical composition: Al2O3-56.54%, SiO2-33.22%, F-17.61%+0%. The contents of F and (OH) are not fixed, so the higher the temperature, the higher the F content. ..

So really topaz is very expensive. Although there is no gold, it is much more than Huang Jingui.