He had a turban on his head, from which a piece of periwinkle shell hung down on his forehead instead of a jewel.
"A General History and Collection of Voyages and Travels, Vol. VIII." by Robert Kerr
Females of other tribes bind their heads with turbans ornamented with shells and other finery.
"Encyclopaedia Britannica, 11th Edition, Volume 15, Slice 6" by Various