Thermoplastics, in basic terms, are melt-processable plastics (materials that are processed with heat). When enough heat is added to bring the temperature of the plastic above its melt point, the plastic liquefies (softens enough to be processed).
In the U.S., diamonds have been found in Arkansas, Colorado, Wyoming, and Montana. In 2004, the discovery of a microscopic diamond in the U.S. led to the January 2008 bulk-sampling of kimberlite pipes in a remote part of Montana.
The Biggest Diamond in the World. South Africa is home to the worldâs largest non-carbonado diamond ever found. It is the biggest gem quality diamond ever found. The Cullinan Diamond named after the mine owner, Sir Thomas Cullinan, was discovered in Pretoria, South Africa. It weighed a staggering 3106 Carats (over 600 grams of beauty). The worldâs largest diamond was discovered on a hot summerâs day at the end of January 1905.