Your answer depends on which part of the diamond industry you're looking at -- mining, distribution, consumption, processing and so forth.
A few brands that lead in the diamond industry are DeBeers, Tiffany, Cartier and so forth.
Depending on which step in the diamond industry you're interested in -- mining, cutting and polishing, brokering, selling -- you could name many countries in, for example: Africa, Australia, Canada, India, Brazil; India and several major cities in Europe and New York City; and many countries world wide (brokering/ selling), respectively.
Africa
Botswana
Africa is the continent that produces the most diamonds, with countries like Botswana, Russia, and Canada being significant contributors to global diamond production.
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The United States is the world's largest producer of corn.
The Philippines are the world's largest coconut producer.
The largest producer of gold is China, while the largest producer of diamonds is Russia.
Thailand is the largest producer of natural rubber in the world.
Exporting basic metals and chemicals provides about 25 percent of jobs and 95 percent of exports. While crops from the agriculture sector provides about 30 percent of the jobs and about 3 percent of exports. Turkey has 60 different minerals that are produced in Turkey. Natural resources - minerals: · antimony · Bauxite · Boron salts - richest mineral deposit - 72% of the world's total · Chromite · Copper · Chrome · Gold · Iron · Lead · Manganese · mercury · Pyrites · sulfer · Zinc Raw materials : · Aluminum · Coal · Cement · Fertilizers · Limestone · Oil · Natural gas · Steel Agriculture: · Almond - eighth largest producer · Apples - sixth largest producer · Apricot - world's largest producer · Barley - seventh largest producer · Cherry - world's largest producer · Chickpeas - second largest producer · Cotton - seventh largest producer · Cucumber - second largest producer · Eggplant - third largest producer · Fig- world's largest producer · Grapefruit - ninth largest producer · Green pepper - third largest producer · Hazelnuts - world's largest producer · Lemon - tenth largest producer · lentil - third largest producer · Olives - fourth largest producer · Onion - fourth largest producer · pistacchio - third largest producer · Pomegranate - world's largest producer · Rye - ninth largest producer · Sugar beets - fifth largest producer · Tomatoes - third largest producer · Tea - sixth largest producer · Tobacco - sixth largest producer · Watermelon - second largest producer · Wheat - ninth largest producer
the world's largest producer of geothemal electicity is the United States of America.
the world's third largest producer of nuclear capacity is Japan.
India is the world's largest producer of Banana.