The park provides pavilions, tables for wet sifting, and open sluice boxes for diamond hunting. Diamonds form deep in the Earth's mantle, appearing like pebbles rather than gems. The park is notable for the largest diamond found in the U.S., the 40.23-carat Uncle Sam diamond. In 2017, over 180,000 visitors found 450 certified diamonds of various colors. Daily diamond discoveries are common, although most are small, about the size of a paper match head. Admission is affordable, and overnight camping options are available to enhance visitor experiences.
The park provides two covered pavilions with water troughs and tables for wet sifting, plus open sluice boxes with hand-operated water pumps at both ends of the field.
Diamonds formed under extreme pressure and heat deep in the Earth's mantle and typically look like a metallic or glassy pebble rather than a sparkly cut gem.
The largest diamond found in the United States came from this field, the 40.23-carat Uncle Sam diamond, discovered in 1924 before the land became a state park.
Visitors find one or two diamonds daily at the park, but most diamonds discovered are about the size of a paper match head.
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