Since moving to Murfreesboro in February, Chad Johnson has found at least 80 diamonds at Crater of Diamonds State Park.

However, on Monday, the former Iowa resident nearly threw away his largest find yet; a cube-shaped, 4.38-carat, tea-colored diamond.

According to Johnson, 36, he used to make ends meet by selling the diamonds he found at the park. But recently, he took a job at a local convenience store partly because he "got tired of selling diamonds."

Johnson's gem is the second-largest diamond unearthed this year at the Crater of Diamonds State Park, the world's only diamond-producing site open to the public. Earlier last June, a Louisiana man found a 4.8-carat diamond.

Opened in 1972, the park yielded its largest find in 1975 with a 16.37-carat Amarillo Starlight, a white diamond found by a Texas visitor.