Ok. I totally want to go there. I’d spend my entire vacation digging for diamonds.
Go right after they plow it up to bring them to the surface, right after a rain and walk into the sun looking for a glint. They look like a smooth piece of glass. It looks like it is is in an old volcano, Take a pair of boots to navigate the sticky clay like soil.
I never found anything but they have several on display in their uncut state and I can see how they would most likely be overlooked.
While you are there Northern Arkansas has some of the most beautiful scenery in the US. I was born in the Southern part which is kind of swampy. (duck-hunting capital of the US.)