Crater of Diamonds State Park is one of the world s only diamond producing mines that is open to the public. The park is operated and managed by the Arkansas Department of Parks and Tourism. Founded in 1906, Crater of Diamonds State Park is known for producing one of the North America s largest diamonds. It offers diamonds of various colors and shades, including white, brown and yellow. The park also features more than 40 types of rocks and minerals, including amethyst, banded agate, jasper, garnet, quartz, calcite, barite and hematite. Additionally, Crater of Diamonds State Park houses a diamond discovery center, water park, gift shop, campground and caf .