Topaz actually has an exceptionally wide color range that, besides brown, includes various tones and saturations of blue, green, yellow, orange, red, pink, and purple. Colorless topaz is plentiful, and is often treated to give it a blue color. Topaz is also pleochroic, meaning that the gem can show different colors in different crystal directions.
Birthstones & AnniversariesPrecious topaz is a birthstone for November and blue topaz is a birthstone for December. Blue topaz is the gem of the 4th anniversary and Imperial topaz is the gem of the 23rd anniversary.
The royal court in Portugal celebrates the discovery of Imperial topaz in 1768.
A transparent topaz crystal discovered in Minas Gerais, Brazil weighs an astounding 596 pounds.
Irradiating colorless topaz with electrons at energy of 10 million electron volts creates a sky blue color.
Yellow, orange, brown, pink to red to purple red, blue , light green and colorless
1.619 to 1.627
0.008 to 0.010
- Mohs Hardness: 8
There are a number of processes used to alter the color, apparent clarity, or improve the durability of gems.Learn More
Some gemstones have synthetic counterparts that have essentially the same chemical, physical, and optical properties, but are grown by man in a laboratory.Learn More
Any gem can be imitated—sometimes by manmade materials or by natural materials chosen by man to impersonate a particular gem.Learn More
Why We Love This Gemstone
Topaz comes in some of the gem world’s largest crystals: the largest are kilos, not carats.
Faceted topaz takes such a high polish it’s slightly slippery to the touch.
Topaz is pleochroic, displaying different colors in different crystal directions.
Topaz comes in a variety of colors from shades of blue to the rare reddish imperial colors.
The most valued topaz colors are orangy red to red. Blue gems are widely available.
Topaz used in jewelry is typically eye clean with no visible inclusions.
Topaz crystals are usually columnar, and cut as oval or pear shapes to improve yield.
Topaz often forms as large crystals. These can yield sizable cut gems.
Topaz Quality Factors: The Comprehensive Guide
Explore sources, gemological research, and the role of gems in history.
The Radioactive Decay Pattern of Blue Topaz Treated by Neutron IrradiationJian Zhang, Taijin Lu, Manjun Wang, and Hua Chen Read Article
An Update on Imperial Topaz from the Capao Mine, Minas Gerais, BrazilDaniel A. Sauer, Alice S. Keller and Shane F. McClure , Dec 1, 1996 Read Article
Pink Topaz from PakistanEdward Gübelin, Giorgio Graziani and A. H. Kazmi , Sep 1, 1986 Read Article
A Field Guide to Topaz and Associated Minerals of the Thomas Range, Utah (Topaz Mountain) Volume 1
John Holfert, et al
Topaz: Perfect Cleavage
Tenth annual Sinkankas Symposium: topaz
San Diego Mineralogical. & Gem Society. & GIA