Where diamonds are found in the United States - Colorado
The state of Colorado has been linked with diamonds since 1875 when two unscrupulous prospectors convinced the president of the Bank of California that they had found a rich diamond field. Their claims were a hoax - they had sprinkled the land themselves with gemstones! Kimberlite was then discovered in the late 1960's at the Colorado-Wyoming state line area in Larimer County, Colorado. In 1975 diamonds were recovered from unique volcanic structures called diatremes (the upper portions of these volcanic structures) which were located northwest of Fort Collins, Colorado. It was an almost unbelievable coincidence that the diamond deposit site was only 150 miles away from the prospectors hoax diamond field! In 1996, the Kelsey Lake mine began mining on a commercial scale and in 1997, the Kelsey Lake Mine produced a 28.18 carat yellow diamond. The mine was closed in 1998 but there are some plans to re-open.
Where diamonds are found in the United States - Wyoming
Diamond Kimberlite pipes have been found in Wyoming, near the Colorado-Wyoming state line area referred to as the Aultman, Ferris and Schaffer kimberlites.
The Herkimer Diamond Mine and the Ace Of Diamonds Mine - New YorkSource of Diamonds
The Herkimer Diamond Mines and the Ace Of Diamonds Mine are not underground mines but are strip mines in the form a gravel pit. There are no diamonds! But faceted quartz crystals with points at both ends are found in this area.
The source of the diamond is a fascinating subject. This page was designed to clarify where they can be found around the world, in the United States and the meaning of Kimberlite, Placer Deposits and Alluvial deposits.
Diamonds are Forever...
An Impartial Guide to Diamonds