Topaz has a chemical composition of Al2SiO4(F,OH)2. The fluorine in its composition is a limiting factor on its formation. Fluorine gas in concentrations high enough to form minerals only occurs in a few geologic environments. Most topaz grows as crystals within the veins and voids of igneous rocks. This topaz is found in the cavities of…

The type of irradiation used to transform colorless topaz into blue topaz can cause the irradiated material to become slightly radioactive. Fortunately, the radioactivity level of the topaz begins to decline as soon as treatment is complete. It eventually declines to a level that is safe for the topaz to be handled during manufacturing and…

Today most topaz offered in department stores and mall jewelry stores at low to moderate prices has been treated in a laboratory. Colorless topaz can be heated, irradiated, and coated with thin layers of metallic oxides to alter its color. Natural blue topaz is extremely rare and is usually pale blue. Almost all of the…

The name “topaz,” and variants of the name in other languages, have been used for yellowish gemstones for at least two thousand years. At that time yellowish gems were called “topaz” in many parts of the world. Many of the earliest gem traders did not realize that these yellowish stones were actually different materials. Then, about two…

Topaz occurs in a wide range of natural colors; however, most natural topaz is colorless. The most highly regarded colors are the reds and pinks, which receive their color from trace amounts of chromium. Chromium is also responsible for the color in violet and purple topaz. A variety known as “imperial topaz” is especially valuable…

One of the best-known physical properties of topaz is its hardness. It has a hardness of 8 on the Mohs hardness scale, making it the hardest silicate mineral. Every student who takes a physical geology course learns about the exceptional hardness of topaz. Diamond, corundum, and chrysoberyl are the only commonly known minerals that are harder than topaz. Topaz occurs in a…

Topaz is the original modern birthstone for the month of November. Its status as a traditional birthstone contributes significantly to the gem’s popularity and is the reason behind many sales. Topaz jewelry is sold in almost every jewelry store in the United States. In 1952, Jewelers of America made a few modifications to the list of modern…

Topaz is a rare silicate mineral with a chemical composition of Al2SiO4(F,OH)2. It is best known for being these four things: Topaz obtains much of its popularity from its beautiful colors and its status as a birthstone. Natural topaz colors include rare and valuable yellow, orange, pink, red, purple, and blue. The most affordable and frequently purchased are…