It is a contemporary made marble.
I cannot remember the name of the of the artist here in the USA but he/she did these quite well and they are/were expensive.
I want to call them ---" Dragon eggs" but I am not too sure. I could never afford them--I still liked them though, still do.
This one is a knock off from the OG.
Maybe @Alan has a clue here to share with us.
Marble--On!!