Overview

• Raynae Madison and relatives from Cookson, Oklahoma, discovered the stone on Sept. 13 during a birthday trip to the park.
• They were digging and sifting near the Prospector Trailhead on the north side of the 37.5-acre search area using dollar-store tools.
• Staff at the Diamond Discovery Center identified a 2.79-carat chocolate brown diamond with unique inclusions, which the family named the William Diamond for Madison’s nephew.
• Officials say 403 diamonds have been registered at the park in 2025, including four over two carats, with this gem ranked third for the year alongside earlier 3.81-carat and 2.30-carat finds.
• Park interpreter Emma O’Neal said the brown color results from plastic deformation in the crystal structure, and coverage notes uncut stones’ values vary widely, with a StoneAlgo estimate ranging roughly from $11,500 to $106,000.