Pure topaz, like pure corundum, is transparent and colorless. The wide range of topaz colors that are available is due to either natural trace impurities or defects .
While it does not come in the wide range of colors that gemstones like garnet or sapphire. Topaz, like many natural gemstones, is a gemstone of the ages.
The element chromium causes natural pink, red, and violet-to-purple colors in topaz. Imperfections at the atomic level in topaz crystal structure can cause yellow, .