The beadmaker's name is Daniel Silverberg. He doesn't make beads commercially; he does it because he loves the work.
This bead is made of fossil-bearing limestone. It is 4 feet (1.2 m) in diameter and averages 9 inches (23 cm) in width.
Atop the bead is a piece of carved California jade. He couldn't find the picture of Clark the cat resting in the hole.
In Dan's words: "There is something elusive and fundamental about beads and bead making that can't be more than provisionally defined. I am, however, always interested in other perspectives and experiences."
By the way, Dan says he finds it curious that people ask if the big bead above is carved all the way around. It is.