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Zircon is an underrated gemstone that鈥檚 often confused with synthetic cubic zirconia due to similar names and shared use as diamond simulants. Few people realize that zircon is a spectacular natural gemstone available in a variety of colors.

The name 鈥渮ircon鈥� likely comes from the Persian word zargun, meaning 鈥済old-colored.鈥� Others trace it to the Arabic zarkun, meaning 鈥渧ermillion.鈥� Given its wide range of colors鈥攕panning red, orange, yellow, green, blue, and brown鈥攂oth origins are plausible.

Zircon commonly occurs as brownish red, which can be popular for its earth tones. However, most gem-quality stones are heat treated until colorless, gold or blue (the most popular color). Blue zircon, in particular, is the alternative birthstone for December.

Color differences in zircon are caused by impurities, some of which (like uranium) can be slightly radioactive. These gemstones are also treated with heat to stabilize the radioactivity.

While radiation can break down zircon鈥檚 crystal structure, it plays a crucial role in radiometric dating. Zircon, the oldest mineral on Earth, contains important clues about the formation of our planet.

Colorless zircon, known as Matura Diamond, displays brilliance and flashes of multicolored 鈥渇ire鈥� that can rival fine diamond. There鈥檚 one key difference though: Zircon is more brittle. Though it measures 7.5 on the Mohs scale of hardness, its faceted edges can chip.

Zircon from Australia dates back 4.4 billion years. Australia still leads the world in zircon mining, producing 37 percent of the world鈥檚 supply. Other sources include Thailand, Sri Lanka, Tanzania, Cambodia, Canada, and the United States.