Mali, Iron necklace "amma talu" or "nommo koro" with stone bead from the Dogon people. Pendants of polished stones were called "dugo". They were looked upon as "signs of alliance" between the wearer and a spiritual power. "Hogons" for example, the supreme religious authorities of the Dogon, are priests of Lebe and wear "dugo" necklaces that ally them with this mythic ancestor.