While in Louisiana, Navas learned about the Crater of Diamonds and decided to visit the park before leaving the country.
"I got to the park around nine o'clock and started to dig," Navas told state park officials. "That is back-breaking work so by the afternoon I was mainly looking on top of the ground for anything that stood out."
Navas ended up picking up a shiny stone that turned out to be a 7.46-carat brown diamond.
"I am so happy! All I can think about is telling my fiancee what I found," he said.
Navas dubbed his discovery the Carine Diamond, after his fiancee.
Assistant Park Superintendent Waymon Cox said Navas' luck was likely helped by recent rains.
"We periodically plow the search area to loosen the diamond-bearing soil and promote natural erosion," he said. "As rain falls on the field, it washes away the dirt and uncovers heavy rocks, minerals and diamonds near the surface."
