Extract from GIA Textbook: Diamonds

A #diamond has to go through a lot before it reaches #eClarity. It forms 5-40 kilometers deep in the earth under extreme heat of 900C to 1300 C and high pressure between 45 kilobars to 60 kilobars (pressure on earth at sea level is 1 kilobar). Diamonds formed wait up to billions of years before a violent eruption bring them the surface. Then it is cut and polished until its natural beauty shines through. Photo: Denis Finnin/American Museum of Natural History. Courtesy: GIA. Resource: Amanda