Zircon
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Zircons are very common minerals which occur naturally in clear, yellow, brown, orange and reddish-brown colors. Zircon is frequently heat treated to enhance or alter their color. Mohs scale: 6.5-7.5.
Many people confuse the natural gem zircon with cubic zirconia which is a man-made, synthetic used as an inexpensive alternative to a diamond. Note that these are completely different materials.
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