|Topaz is a silicate mineral of aluminium and fluorine.|
Pure topaz is colorless and transparent but is usually found tinted by impurities; typical topaz is wine, yellow, pale gray, reddish-orange, or blue brown.
|There is no official standard for imperial topaz. Some dealers use the term for colours that are orange to pink to red to purple, others reserve the term for certain saturated shades.|
It’s the colour, not the term “Imperial” that gives topaz its value. Imperial Topaz, with its distinct peach, pink, orange or champagne hues, is the rarest topaz variety and the most valuable.
|The primary source is the Ouro Preto mines of Minas Gerais, Brazil. Deposits were also found in the Urual Mountains in Russia. Imperial topaz was named in honor of the Russian monarchy who prized it. Today imperial topaz is classified as a very rare collector's gem. |
The price and value of imperial topaz vary depending on the size and quality of the gemstone. True imperial topaz is always untreated, and material which has been colored by artificial means such as irradiation is not regarded as genuine imperial topaz.