Topaz actually has an exceptionally wide colour range that, besides brown, includes various tones and saturations of blue, green, yellow, orange, red, pink, and purple. Colourless topaz is plentiful, and is often treated to give it a blue colour. Topaz is also pleochroic, meaning that the gem can show different colours in different crystal directions.
Birthstones & Anniversaries
Precious 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 colourless topaz with electrons at energy of 10 million electron volts creates a sky blue colour.
Yellow, orange, brown, pink to red to purple red, blue, light green and colourless
1.619 to 1.627
0.008 to 0.010
- Mohs hardness: 8
There are a number of processes used to alter the colour or apparent clarity, or to 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 man-made 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 colours in different crystal directions.
Topaz comes in a variety of colours from shades of blue to the rare reddish imperial colours.
The most valued topaz colours are orangey red to red. Blue gems are widely available.
Topaz used in jewellery 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 sizeable cut gems.
Topaz Quality Factors: The Comprehensive Guide
Explore sources, gemmological research and the role of gems in history.