David DeCook found a 3.81-carat diamond at Arkansas's Crater of Diamonds State Park, the largest discovered there this year.

One lucky Minnesotan and his family unearthed a 3.81-carat diamond during a recent visit to Diamonds State Park.

Established in 1931, the Gemological Institute of America (GIA) is the world’s foremost authority on diamonds, colored stones, and pearls. A public benefit, nonprofit institute, GIA is the leading ...