last edited: 2/26/18 number of photos: 12
Zircon is ZrSiO4
hardness: 6.5 to 7.5
zircon as a mineral
Many faceted zircons have been heat treated between 850 and 1000 degrees Celsius in order
to improve their color. Heating in the presence of air creates a golden yellow. Heated without
air produces a blue color.
zircon, faceted-blue: A B C D
zircon, faceted-green: A
zircons, faceted-variety of colors: A
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