Search:

If you google "Black marble" you'll find pictures like these, resembling the stone in the OP. Perhaps someone into rocks and minerals can tell whether the stone in the OP is really marble.

A_S did...

Here's a thread about the subject.

In the case of a normal auction if a stone is mentioned here the price can easily double. In this case someone could have been considering a Best Offer, do a...

MadsL, you really shouldn't start a thread and ask question about a stone from a live auction, it's frowned upon. You should either wait until the auction is over or ask someone through pm. It just...

Super rare priceless stone of unimaginable fineness :p