This is interesting. My assignment in Ceramics I was to find ancient pottery and write a small paper. My paper is actually on a vessel, but I found this beauty in an auction from 3500-3000 BC and it was going for a mere $450.
(from the website)
“The linear design represents two human figures crossed. The design can also be read as a double lined cross under a single line cross of “X” shape. D: 41 mm. Not published in Sarianidi, Die Kunst Des Alten Afghanistan. This remarkable seal has the density of limestone. A choice and very rare seal.”>
Looks like it would make a pretty bead.