The entire process takes 6 months (literally) because of how they go about animating the episodes. The shows are mostly drawn by hand. South park however uses computers which, in turn, allows them to do everything in 5 days. So what the Simpsons does is they prepare a whole season 6-8 months ahead of time.
Most natural diamonds are formed at high temperature and pressure at depths of 140 to 190 kilometers (87 to 118 mi) in the Earth’s mantle. Carbon-containing minerals provide the carbon source, and the growth occurs over periods from 1 billion to 3.3 billion years (25% to 75% of the age of the Earth).