There was one in North Carolina in about l897 but surely that has all gone over to (Trap Rock) unproductive minerals. Herkimer"s mine in upstate New York produced quartz Crystals, not the Hard Rock Mohs-l0 stuff.
The US state of Pennsylvania is not known for its diamond mines.
Arkansas.
Herkimer County, New York State
Arkansas.
California.
Heigh Ho
There is no mine at Crater of Diamonds State Park in Arkansas, but visitors can dig for diamonds and keep whatever they find.
it is the only state contains a diamond mine
The Diamond Mine was created in 2005.
You can mine diamonds in the Arkansas Diamond Mine, in Murfreesboro, Arkansas, as below.
The largest diamond mine in area is in Botswana, in Africa: The Orapa diamond mine. Read more about it, below.
Ekati Diamond Mine was created in 1998.