Tana Clymer found the diamond last October while hunting for gems with her family at Crater of Diamonds State Park in Murfreesboro, Ark. She said she couldn't believe her good luck and asked her father if she was dreaming.
She told television station KWTV at the time she noticed something on the surface of the ground after sifting through a search field for about two hours.
"I thought it was a piece of paper or foil from a candy wrapper," Tana said. "Then, when I touched it, I thought it was a marble. I think God pointed me to it. I was about to sprint to join my family, and God told me to slow down and look. Then, I found the diamond!"
The yellow diamond the teen found is teardrop-shaped and about the size of a jellybean.
Tana named the diamond "God's Jewel," park officials said.
Tana told KWTV that she plans to use the money from the recent sale of the yellow diamond to help pay for college.
Last month, a Louisiana man found a 2.89 carat white diamond at the park. Brandon Kalenda of Maurepas found the gem on March 6 and said he plans to keep it. Kalenda named the diamond "Jax Diamond" after his infant son Jackson.
The park is the only diamond-producing site in the U.S. that is open to the public. Other gems discovered at the state park include amethyst, garnet, peridot, jasper, agate, calcite, barite, and quartz.
The Associated Press contributed to this report.