Colourless zircon is known for its brilliance and flashes of multicoloured light, called fire. These zircon properties are close enough to the properties of diamond to account for centuries of confusion between the two gems.
Zircon occurs in an array of colours. Its varied palette of yellow, green, red, reddish brown and blue hues makes it a favourite among collectors as well as informed consumers.
Birthstones & Anniversaries
Zircon is a birthstone for the month of December, along with turquoise and tanzanite.
Zircon found in Australia is the oldest mineral on earth: 4.4 billion years old.
Zircon sometimes contains traces of uranium, irradiating itself and changing its properties.
Colourless zircon is called “Matara” zircon after a city in Sri Lanka near where it is mined.
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
With radioactive trace elements that tick off time, zircon is a geological clock that tells us about the early earth.
Brilliance and Fire
Zircon has very high luster, refractive indices, and dispersion, giving it lots of brilliance and rainbow flashes of fire.
Zircon’s pronounced double refraction means you can see twice as many facets and twice as much fire.
Among consumers, blue is the most popular colour of zircon.
The most valuable colours of zircon are blue, bright red, and green.
Zircon is often eye-clean. Gems with noticeable inclusions are less valuable.
To maximise its brilliance, zircon is most often cut in rounds and ovals.
Zircon in fine quality is rare in large sizes. Zircon weighs more than most gems of like size.
Zircon Quality Factors: The Comprehensive Guide
Explore sources, gemmological research and the role of gems in history.
Reversible Colour Modification of Blue Zircon by Long-Wave Ultraviolet RadiationNathan D. Renfro , Nov 7, 2016 Read more in English