Your guide to zircon
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zircon
Zircon is considered by some to be an alternative birthstone for the month of December. It comes in both clear, blue and yellow varieties, though these are often heat treated to improve the colours.
Zircon has become more important to scientists since the introduction of radiometric dating. The oldest known object on earth is a zircon crystal, it has been dated to about 4.4 billion years old.
