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
Portugal
Your answer depends on whether you mean the country that mines the most diamonds -- probably Botswana (this position can rotate among several African countries), or cuts and polishes the most diamonds -- probably India, or brokersthe most diamonds -- probably (Amsterdam in) Holland.
Saudi Arabia.
Indonesia,Malaysia and Thailand
China produces the most goods imported by other nations, followed by Germany and the United States. It is also the most populated country so it has to produce as much as it can to take care of the people.
Australia is a single country. It is divided into six states and two territories. The state which produces the most diamonds is Western Australia.
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china
Most diamonds come from Africa, although businesses also mine for diamonds in Canada and Australia.
The country that produces the most calculators is India.
Botswana
Italy produces the most lamborghinis
Uganda produces the most bananas.
In Europe, Poland produces the most coal.
China produces the most with the U.S.A in a close second
Australia produces brown diamonds from their mines.
Africa.