Can't tell much based only on those numbers, but my spidey senses tell me it is unlikely to be lively and full of contrast with that depth (at best) and may actually be very unattractive (at worst). Have you seen it? Have photos?
I have seen it. I'm not sure how to judge, as it wasn't great lighting. I'm not sure how to determine if it was leaking light. I did see a couple of carbon specks at the edge under the table, which I could see with my naked eye. I actually had a harder time finding them with a loupe.
What do you suggest I look for, and could you provide some guidelines on how to inspect the stone, if I were to see it again?