Only very small amounts of diamond ore are actual diamonds. Historically, diamonds were known to be found in alluvial deposits in south India. Diamond production only started in the 1870s after the discovery of the diamonds fields in South Africa. About 4.5 billion carats of diamonds have been mined since then.  About 20 percent of this has been mined in the last 5 years.  In the United States, diamonds have been found in Colorado, Arkansas, and Montana. In 2005, Russia produced about one-fifth of the global diamond output. Australia has the richest “diamaniferous pipe” with about 42 metric tons per year in production.

http://en.wikipedia.org/wiki/Carbon,

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