8.0 on the Mohs scale.

The same as silver topaz. However, Teal topaz is not found in nature. Topaz and citrine are the birthstones of the month of November.

Teal with an azotic coating treatment that produces these colors. This is a patented process of Azotic Coating Technology, Inc. and produces this variety they call "Mystic Fire Topaz". All stones shown on this page were enhanced by Azotic Coating Technology Inc. Similar in appearance to rainbow topaz, which is also silver topaz, but enhanced by a completely different process.

Silver topaz (colorless), treated with a patented azotic coating process to produce a permanent and stable beautiful teal topaz with a play of colors.

More information on gemstone enhancements.

Teal Topaz is a member of the Precious Topaz gemstone family.