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At normal temperature and pressure, 20 °C (293 K) and 1 standard atmosphere (0.10 MPa), the stable phase of carbon is graphite, but diamond is metastable and its rate of conversion to graphite is negligible.The most common crystal structure of diamond is called diamond cubic.
However, the phases have a wide region about this line where they can coexist.Most were formed at depths between 150 and 250 kilometres (93 and 155 mi) in the Earth's mantle, although a few have come from as deep as 800 kilometres (500 mi).Under high pressure and temperature, carbon-containing fluids dissolved minerals and replaced them with diamonds.Diamonds (especially those with rounded crystal faces) are commonly found coated in nyf, an opaque gum-like skin. They are referred to as opaque if the fibers grow from a clear substrate or fibrous if they occupy the entire crystal.Their colors range from yellow to green or gray, sometimes with cloud-like white to gray impurities.
The two most common allotropes of pure carbon are diamond and graphite.