Hi Will
As always a nice bead and teaching point.
i didnt know that in incient china also they use to put beads on tongues of dead person.thx for telling this.i have seen and had many tongue agate bead.even one with ancient calligraphy.
most persian tongue agate beads were flat like this one which i saw in this link.
cheers
Ali

http://www.ancientsuns.biz/bead-collections/ancient-flat-stone-beads/