|Crater of Diamonds State Park is a 911-acre (369 ha) Arkansas state park in Pike County. The park features a 37.5-acre plowed field ... the world's only diamond-bearing site accessible to the public.|
The diamond-bearing soil in the search area is plowed periodically to help bring more diamonds to the surface.
|The Arkansas Diamond Mine at Crater of Diamonds State Park has a policy of "finders, keepers," meaning the diamonds you find are yours to keep.|
Diamonds were first discovered in 1906 when John Huddlestone found two strange crystals in the soil of his farm. His farm was right above a volcanic pipe filled with lamproite.
Word of the discovery spread and a "diamond rush" began.
|Soon thousands of people descended upon the Murfreesboro area, however, the Huddlestone farm and immediately adjacent land was the only location with promise of becoming a diamond mine. The diamond-bearing pipe was several hundred yards in diameter. There are other volcanic pipes in the area but they have yet to yield more than a few diamonds.|
|Prior to Huddlestone's discovery, geologists at the Arkansas State Geological Survey suspected that diamonds might occur in the greenish peridotite soils near Murfreesboro because they were similar to the soils above the African diamond deposits. They did fieldwork in the area but did not find any diamonds.|
|Since the park opened in 1972 there have been about 30,000 reported diamond finds. Most of the diamonds found are very small - too small for cutting into a mountable stone. The 30,000 stones reported have an aggregate weight of a little under 6,000 carats, making the average stone about twenty points (.20 carat) in weight.|
|Although most stones found are small, some spectacular diamonds have been found.|
The "Uncle Sam Diamond", the largest diamond ever found in the US, was found there in 1924. This pale brown, 40.23 carat stone was found in 1924 by W.O. Bassum. It was cut into an emerald-cut gem weighing 12.42 carats which was sold in 1971 for $150,000.