World's 20 Highest Value Diamond Mines

diamonds are far rarer than gold. Only about 175,000 tons of gold have been mined in all of human history. The estimate for total rough diamond production is around 500 tons, of which just 20% to 30% are gem-quality stones.
The value of scarcity is indicated in the difference between the price of gold, currently around $1,700/ounce, and as much as $1,800/carat for a diamond. There are 5 carats in a gram and about 30 grams in an ounce, for a diamond price of $270,000/ounce. At the average price of $100/carat, an ounce of diamonds costs nearly two times as much as an ounce of gold.

Mine	Company	Estimated $ per tonne revenue 2011
International [UG]	Alrosa	over 250
Nyurbinskaya	Alrosa	over 250
Mir [UG]	Alrosa	over 250
Aikhal [UG]	Alrosa	over 250
Diavik	Rio Tinto /Harry Winston	over 250
Jwaneng	Debswana	over 250
Snap Lake	De Beers	100 to 250
Udachny [OP]	Alrosa	100 to 250
Ekati	BHP	100 to 250
Victor	De Beers	100 to 250
Murowa	Rio	100 to 250
Lethlekane	Debswana	100 to 250
Fissures	Petra Diamonds	100 to 250
Orapa	Debswana	100 to 250
Venetia	De Beers	50 to 100
Jubilee	Alrosa	50 to 100
Archangelskaya pipe	Alrosa	50 to 100
Kimberley	De Beers	50 to 100
Cullinan	Petra	50 to 100
Voorspoed	De Beers	under 50