Here's to help out the OP!
I was just over at his place a few days ago to see these rocks in person. They're really something, better than the "Zebra Rock" I got from AFA(AquaForestAquarium), I can tell you that! AFA sells their zebra rocks for $4 a lb.
Attached, are some pics of the rocks I got from him. They're MUCH darker and look much better than the Zebra rocks I got from AFA.
Pic inside the tub of water are all the rocks I got from him, you can see they're still dark, if not darker, when in water.
The tank picture also shows how dark they are. My bright light kinda made them shine though, so forgive my lighting. You just have to see this in person. I have his rocks inside my tanks and my livestock are all doing fantastic. They were all clean before given to me, so I had little to no cleaning on my part
Fantastic guy to deal with, I highly recommend. These rocks are certainly the best rocks I ever got. I just wish I got these rocks sooner, before blowing 100+ dollars on Zebra rock that don't even look half as good as these...
*note* the picture of the rocks inside my tank that are in the front are both from him. The rock in the back (left side) are from AFA zebra rocks. That piece was like, mainly just white and barely any black.