I guarantee you'll never see this again. The stone is called Picasso Marble. I saw it and had to have it. Once you have it, others will try to get it away from you. You must hang tight.
The piece is set in sterling and fine silver.
The pendant is on the large size - about 2 1/4 inches tall and about 1 3/4 wide. It is suspended on an 18" natural black rubber cord with sterling end clasp.