Diamonds are produced under environments of extreme temperatures (over 1500°C ) and pressure (above 50,000 atm) deep below Earth's crust (150-300 kilometers). To find diamonds near surface of the Earth, only those produced in 200 km deep Kimberlites and Peridotites are possible; no diamonds are found in basaltic rocks and andesites that are formed under 30,000 atm. Diamonds may also be found in areas of high pressure metamorphic rocks, but their granule diameters are too small to be made into jewels.