Zircon (ZrSiO4) is a diamond-like type of mineral that crystallizes as small, double terminated crystals, but also as tabular prismatic square crystals. Zircon is a heavy, dense, mineral ranging in color from grey, brown, yellow or red, to colorless. The colorless forms of zircon is often used as synthetic diamonds, although in terms of hardness, they are similar to quartz; their hardness is only 7.5 on the Mohs scale and they are called Matura Diamonds. Zircon is amongst the oldest of minerals on earth, and the oldest specimens found are around 4 billion years old. They have been mined for
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