"A diamond is a pure crystal of carbon which those in the know believe started life deep in the earth many thousands of years ago. The carbon dislodged from the ledge by volcanic disturbances, mingled with molten rock and made its way under pressure along cracks and fissures towards the earth’s surface. Then more volcanic action probably occurred and the whole process repeated itself: break, fold, remelt and rise. The carbon finally transformed into a diamond and settled in a rocky mix of soil called “Blue Earth”, along with Pyrope, Garnets, Olivines, shiny flakes of Mica and a few other gems formed under similar pressure and heat."
January 1, 1970
https://en.wikiquote.org/wiki/Diamond