Alrosa, Russian Federation
Anglo American plc, United Kingdom
Blue Nile, USA : Diamond retail e-commerce company in the world
De Beers Group, Belgium
Debswana Diamond Company Ltd., Botswana.
Dominion Diamond Corporation, Canada
Gem Diamonds, United Kingdom
James Allen, USA : privately-held retail diamond company in the world
Lucara, Canada
Petra Diamonds, United Kingdom
Rio Tinto, Australia (Argyle Mines)
Rio-Tinto Diamonds, United Kingdom
Rockwell Diamonds, Canada

Diamond mines are only in 12 countries
(Nothing in Europe, South America, Antarctica)
This is from our reserach and we can not gurantee. If there are mistakes, do email it to Datacentre.

50 largest mines accounting for approximately 90% of global supply.

Africa continent
Country : Angola (4 diamond mines)
Luele , Catoca , Fucauma , Luarica

Country : Botswana (6 diamond mines)
Damtshaa, Jwaneng, Letlhakane, Orapa, Karowe, Lerala

Country : South Africa (8 diamond mines)
Baken, Cullinan (previously "Premier mine"), Finsch, Kimberley, Northern Cape, Koffiefontein , Venetia , Royal Thulare

Country : Zimbabwe (3 diamond mines/ fields)
Baba , Marange , Murowa

Country : Tanzania (1 diamond mine)
Williamson

Country : Lesotho (2 diamond mine)
Kao, Letseng

Country : Democratic Republic of the Congo (1 diamond mine)
Miba

Asia continent
Country : Russia (8 diamond mines)
Mirny GOK, Udachny GOK, Jubilee, Grib, Aikhal, Komsomolskaya, International, Zarnitsa
(Alrosa, Russia's leading diamond company, accounting for 95% of Russian diamond production)

Country : India (2 diamond mine)
Kollur, Panna

Country : Indonesia (2 diamond mine)
Cempaka , Martapura

Australasia continent
Country : Australia (2 diamond mine)
Argyle, Ellendale , Merlin

North America continent
Country : Canada (7 diamond mines)
Diavik (Northwest Territories), Ekati (Northwest Territories) , Jericho ( Nunavut), Snap Lake (Northwest Territories), Victor,
Gahcho Kue (Northwest Territories), Renard (Quebec )

USA (No present)
Crater of Diamonds State Park, Arkansas (Former mine now a state park)
Kelsey Lake Diamond Mine, Colorado (Former mine no longer in operation)