well that would make sense since the first one is priced a little higher. but that could be cuz it's bigger too
i just can't let go of how much it looks like the stone from takeda's site, but of course looking the same and being the same are two different things
the website also says this "The grade ranking indicates the overall quality of the stone as determined by the probability of a flaw being present and by its size. An 'A' grade stone is the highest quality stone with both the lowest flaw probability and the largest size. 'B' and 'B1' grade stones are also high quality, but are smaller, 'B1' being the smallest. Minimum stone dimensions are stated in the price lines."
the first stone is rated B, the second is B1