Natural, earth mined & untreated TOPAZ

Topaz is a crystalline mineral in the silicate group. It has a chemical formula of Al2SiO4(F,OH)2, and that “F,” fluorine, makes it an uncommon mineral.

 

Unlike many gems, most topaz gets its color from color centers rather than chromophores. Color centers are defects in the crystal structure, while chromophores are chemical impurities.

 

The most common colors of untreated topaz are blue, yellow, orange, and brown. These colors are caused by color centers.

Blue topaz occurs much more rarely in nature.

 

Still, the rarest colors of topaz are pink and red. Unlike the other colors, impurities of the rare element chromium provide the color for these stones. Since chromium is a heavier element, it’s unusual to find it in the same mineral as a light element like fluorine. This rare combination makes naturally colored pink topaz a highly sought collector’s stone.