Picard Museum has a most helpful group of on-line bead exhibits.

http://www.picardbeads.com/e_archive.html

all on line exhibits

Chevron/Star beads from the 1700s to 1800s
Dutch or Venetian?

http://www.picardbeads.com/exhibit10.html

Venetian chevron/star beads from 1800 to the mid-1900s

http://www.picardbeads.com/exhibit9.html

Picard Museum is permanently on our links page.