We have been there - don't even know how many times anymore. Love it!!
We were very lucky the very first time we went there (years ago), to have met, and been personally taught, by James Archer. (all by accident).
He was a Crater of Diamonds legend - and a really, really, nice man. He showed us where to look to dig, how to dig, and, more importantly, how to use that rascally sarucca! Then, he taught us how to find a diamond - unfortunately, it was from one of his piles.
We did find 1 small diamond - but there have been diamonds found on every trip while we were there. One time, a lady found a diamond on her dog, when she got home.
Crater of Diamonds has soil that, if its damp or wet, and you walk through it, it sticks to you - and your feet get bigger, and bigger and heavier and heavier. This lady's dog was with her, and the dog got full of that mud. When she went home (she was local), she washed her dog in her bathtub, and, found a diamond when it fell off the dog - I guess she heard it, thought it was a stone, and didn't want it to go down the drain with the dog hair. She came back to the office, screeching - with her dog. It was neat.
According to James - and we always do it that way - you look for a spot where water runs off the field. Dig down - you will know when you are in the right area, because the stones get whitish (barite). Fill your bucket, go to water, put some in your sarucca, dip straight down into the water then, bounce, bounce, bouce, turn - bounce, bounce, bouce turn (after each set of bounces, you turn a quarter of a turn during the next bounce).
When everything is nice and clean, find a spot in the sun, and, in all one motion, turn it upside down and smack it down - then go do the next one. When you are all finished with your bucket, all your piles should be dry. You should be able to see the barite on top (formerly the bottom), and if there is something shiny, check it out. Diamonds never look dry, they look kind of greasy. James told us he slowly checks the very top, and then slowly spreads it out - he used to look like he was frosting a cake or spreading sauce on a pizza.
Just so you know, just across and up the road from there, there is another campground - they have found diamonds there, too.
Beth