From the list of diamond mines, below, it appears that Northwest Territories is the location of the most mines.
Most diamonds come from Africa, although businesses also mine for diamonds in Canada and Australia.
The country that produces the most synthetic diamonds is the United States. The Apollo Diamond Company in Boston Massachusetts produces the most according to Smithsonian.com
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Australia is a single country. It is divided into six states and two territories. The state which produces the most diamonds is Western Australia.
In Canada, Nunavut is the most Eastern territory.
Diamonds are cut in the Netherlands, in India, in Canada and Australia. India may cut the most diamonds, since most small stones are cut there.
Africa is the continent that produces the most diamonds, with countries like Botswana, Russia, and Canada being significant contributors to global diamond production.
The highest populated province (or territory) in Canada is Ontario.
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territory is Nunavut province is Newfoundland
Northwest Territories
Ontario