Zircon
1.2 carats
Zircons with the highest values in optical properties are designated as high zirons, those with the lowest values as low zircons. In between are the medium zircons.
Zircon Gemstones by Colour
This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
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Zircon Gemstones by Size
This table shows distribution of Zircon gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:1.00 cts
Heaviest:36.79 cts
Average:5.59 cts
Total photos:25
Do you have a larger Zircon? Why not upload a photo?
| General Information | ||||||
|---|---|---|---|---|---|---|
| Varieties/Types: | Hyacinth - Yellow-red to red-brown zircon. Starlite - Blue heat-treated zircon. | |||||
| Chemical Formula |
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| Zircon Treatments | ||||||
| The brown varieties are heat-treated at temperatures of 1472-1832 degrees F (800-1000 degrees C), producing colorless and blue zircons. These colors do not necessarily remain constant; ultraviolet rays or sunlight can produce changes. - Gemstones of the world, Walter Schumann, 2001, p 108 | ||||||
| Synthetic Zircon | ||||||
| Synthetic zircons are only of scientific interest. - Gemstones of the world, Walter Schumann, 2001, p 108 | ||||||
| Physical Properties of Zircon | ||||||
| Mohs Hardness | 7.5, Blue Chart Gem Identification (2010) High typeMore from other references | |||||
| Specific Gravity | 3.93 to 4.73, Gemstones of the world (2001) More from other references | |||||
| Tenacity | Brittle, Blue Chart Gem Identification (2010) May show abraded facet junctions, brittleness increasing with heat-treatmentMore from other references | |||||
| Cleavage Quality | Indistinct, Gemstones of the world (2001) More from other references | |||||
| Fracture | Conchoidal, Gemstones (2009) | |||||
| Refractive Index | 1.810 to 2.024, Gemstones of the world (2001) More from other references | |||||
| Optical Character | Uniaxial/+, Blue Chart Gem Identification (2010) More from other references | |||||
| Birefringence | 0.045 to 0.059, Blue Chart Gem Identification (2010) High typeMore from other references | |||||
| Pleochroism | Red zircon - distinct: purplish-red - reddish-brown; Orange/brown zircon - weak: yellow-brown - red-brown; Yellow - weak: honey-yellow - brown-yellow; Blue - strong: colorless to gray - blue; Green - weak: brownish-green - green, Blue Chart Gem Identification (2010) More from other references | |||||
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