What is Zircon?


Zircon is a mineral belonging to the group of nesosilicates. It’s primarily found in Australia, Thailand, and Sri Lanka. Zircon is often used as a gemstone and is popular for its high refractive index and range of colors, including colorless, yellow, red, and blue.

Zircon is a versatile gemstone that comes in a variety of colors, often including colorless, yellow, red, and blue. Its high refractive index gives it exceptional brilliance, making it a popular choice for jewelry such as rings and pendants.

Gemstone Properties

Chemical ClassificationInorganic - Zirconium silicate
ColorComes in a variety of colors, including blue, red, yellow, green, and clear. Blue is the most popular.
LusterVitreous to adamantine.
TransparencyTypically transparent, but can be opaque in some varieties.
OccurrenceAustralia, Sri Lanka, and Cambodia.
FormationZircon crystals form in igneous rocks and have been found in sedimentary deposits.
CleavagePerfect in two directions
Mohs Hardness6.5 - 7.5.
Specific GravityApproximately 3.93 - 4.73, but can vary based on type and treatment.
Diagnostic PropertiesHigh refractive index, often heat treated.
Chemical CompositionZrSiO4
PleochroismWeak to strong, depending on the color of the Zircon.
Crystal SystemTetragonal
Optical PropertiesUniaxial (+)
Refractive Index1.810 - 2.024
2V angleMeasured: 78° to 82°
Dispersion0.039, which is very high and contributes to Zircon's fire.